Arapahoe County Assessor Property Search 2026: Map & Tax

Arapahoe County, Colorado • owner, address, PIN, AIN, tax and map guide

Find the Right Arapahoe Property Record

Search Arapahoe County real estate by address, PIN or AIN through the official Assessor parcel system, then use ArapaMAP for spatial research, the Treasurer for tax balances and the Clerk & Recorder for deeds and recorded documents.

This 2026 guide also explains the real-estate owner-name limitation, business owner searches, PIN and AIN formatting, current valuation basis, expired 2026 protest deadlines, senior and veteran exemptions, tax calculation, tax-lien risk and practical fixes when the official search returns nothing.

Choose My Search Search Step by Step 2026 Dates

2026 real property appeal Closed June 8 The May 1–June 8 valuation protest window has passed.

Senior exemption July 15 deadline The standard 2026 senior application deadline has passed.

Current tax bill 2025 payable 2026 Do not confuse the tax year with the calendar year when paying.

2025 tax lien sale Nov. 5, 2026 Applies to qualifying delinquent tax liens, not ordinary paid accounts.

Fast Answer: Address, Owner, Map or Property Tax?

Real estate: the official Arapahoe Parcel Search supports AIN, PIN and address. Business personal property: the separate Business Personal Property Search additionally provides an owner-name field. Map: use ArapaMAP after identifying the parcel. Property taxes: use the Treasurer Tax Search. Deeds and recorded ownership documents: use the Clerk & Recorder Official Record Search.

Owner-name search warning: the official real-estate Parcel Search does not present a general owner-name search field on its main search screen. Do not assume a private “search by owner” website is the County Assessor’s official tool.

Independent-site disclosure: AssessorPropertySearch.org is not Arapahoe County government. Do not send this site property-tax payments, identification documents, exemption applications or sensitive account information.

Choose the Correct Arapahoe County Property Search Tool

The right database depends on whether you need appraisal data, business property, taxes, maps or a legally recorded document.

Residential, commercial, agricultural or vacant real estate

Use the official Parcel Search for real-estate information. The front page supports AIN, PIN and property-address lookup.

Official Arapahoe County Assessor parcel system Search Real Property

Business personal property or owner name

Use the separate business-personal-property system for machinery, equipment and other taxable business property. Its search page includes an Owner Name field.

Official Business Personal Property Search Search Business Property

Tax bill, payment, receipt or delinquent balance

Use the Treasurer Tax Search. Real-estate and personal-property tax records can be searched by PIN, AIN or address.

Official Arapahoe County Treasurer Search Property Taxes

Parcel map, zoning or spatial context

Use ArapaMAP when you need a map-based view. Start with the Assessor parcel ID whenever possible so you know you are mapping the correct property.

Official Arapahoe County GIS Open ArapaMAP

Deed, lien, release or recorded ownership document

Use the Clerk & Recorder public search. It supports searches involving grantor/grantee names, subdivisions, document types and document numbers.

Official Clerk & Recorder public search Search Recorded Documents

Value, classification, appeal or exemption

Use the Assessor for property valuation, classification, senior/veteran exemption administration and the first stage of a valuation protest.

Official Arapahoe County Assessor resources Assessor Resources

How to Search Arapahoe County Property Records

For a normal house, condominium, commercial building, vacant lot or agricultural parcel, use this sequence.

Open the official real-property Parcel Search

Use the county system for residential, commercial, agricultural and vacant real estate rather than the Business Personal Property Search.

Search the street address if you do not have an ID

Enter the street number or number range and at least the first three letters of the street name. Add a unit only when needed.

Remove street direction and street type

The county specifically says not to enter direction such as N, S, E or W or street type such as Ave, Blvd or Rd in the initial address search.

Open the correct result and save both identifiers

Record the PIN and AIN shown for the property. These are more reliable than repeatedly retyping an address.

Review the property data before using it

Check owner display, situs address, actual value, assessed value, property characteristics, classification, sales and tax-district information.

Move to tax, map or recorded-document records

Use the Treasurer for amounts due, ArapaMAP for spatial research and the Clerk & Recorder for deeds, liens and legally recorded documents.

Arapahoe County Assessor Property Search by Address

Address input	Best practice	Why
House number	Enter the exact number or a small range.	It narrows common street-name results.
Street name	Enter at least the first three letters.	The county search supports partial street names.
Direction	Leave out N, S, E or W initially.	The official help page says direction is unnecessary.
Street type	Leave out Ave, Blvd, Rd, St and similar wording.	The search is designed to work without it.
Unit	Add the unit for condos or multi-unit properties when needed.	It separates units sharing the same base address.
City / ZIP	Do not use these as your first search.	The county address screen is driven primarily by number, street and unit.

Example: instead of entering 1234 E Arapahoe Rd, Centennial, CO 80122, start with the house number and Arap or Arapahoe, then choose the correct result.

Official real-property search Search by Address

Arapahoe County Property Search by Owner or Name

“Search by owner” means different things depending on whether the property is real estate, business personal property or a recorded deed.

Real estate owner search

The main real-property Parcel Search currently presents AIN, PIN and address fields rather than a general owner-name field.

Best route: search the address or exact parcel identifier, then review the returned owner information.

Business owner search

The Business Personal Property Search includes an Owner Name field. If spelling is uncertain, its instructions allow a partial name.

Best route: start broad, then narrow using address, AIN or PIN.

Deed-party name search

The Clerk & Recorder search supports grantor/grantee and other indexed document searches.

Best route: use this when you need a recorded transfer, deed, lien or ownership-chain document.

Why names differ: the assessment record may show a trust, LLC, estate, spouse or other vesting format. A recent recorded deed can also appear in recording records before every assessment or tax display is updated.

Do not treat a name search as a title opinion. Use the recorded deed and appropriate title/legal research when legal ownership matters.

PIN, AIN and Arapahoe County Parcel Number Explained

Identifier	Official format / rule	Best use
PIN	Numeric; county examples show nine digits and state that the PIN begins with 03.	Fast exact lookup in Assessor and Treasurer systems.
Real Estate AIN	0000-00-0-00-000	Exact assessment identification and tax research.
Personal Property AIN	00000-00000-000	Business-personal-property accounts.
State Assessed AIN	00000-00000-0000	State-assessed tax records.

PIN entry rule

Enter the numeric PIN exactly as shown, including leading zeroes. The Treasurer search says not to add spaces, letters or special characters.

AIN entry rule

Enter the AIN with all required leading zeroes and hyphens and without extra spaces.

State-assessed property: the county search warns that state-assessed property is not searchable by street address. Use its PIN or AIN instead.

What Arapahoe County Assessor Property Records Mean

Field	What it helps answer	Do not confuse it with
Owner	Ownership information maintained with the assessment parcel.	A certified title opinion or guaranteed current vesting.
Situs address	Physical location associated with the parcel.	Owner mailing address.
Actual value	The Assessor’s estimate of market/actual value under Colorado valuation rules.	The final property-tax amount.
Assessed value	A taxable-value calculation produced by applying the applicable assessment rate to actual value after relevant adjustments.	The same thing as actual value.
Property classification	Residential, commercial, agricultural or another assessment class.	Zoning approval or permitted land use.
Sales / comps	Market evidence useful for understanding valuation.	Proof that every nearby sale is a legally valid comparable.
Tax district information	Taxing entities associated with the parcel.	The Treasurer’s final tax balance.
Map geometry	Parcel location and spatial context.	A legal boundary survey.

Arapahoe County Assessor Property Search Map

For map-based research, use ArapaMAP and the Assessor’s tax-map resources after identifying the parcel in Parcel Search.

ArapaMAP

Use the county interactive GIS environment for location-based parcel and county mapping research.

Assessor Tax Maps

Use the Assessor’s tax-map resources when you need map-sheet context or parcel-number geography beyond the normal property record.

Legal boundary

Do not use a GIS line alone for a fence, easement, encroachment or title dispute. Review recorded survey/deed evidence and use a qualified surveyor when needed.

Best owner + map workflow

Identify the real-estate parcel by address

Use Parcel Search and confirm the parcel record rather than starting with a broad name search.

Save PIN and AIN

These exact identifiers prevent confusion among neighboring parcels or similar addresses.

Open ArapaMAP

Use the parcel information to locate the correct map feature and inspect surrounding geography.

Return to recorded documents for legal questions

Use Clerk & Recorder records when a map question becomes a deed, easement, lien or legal-description question.

Official Arapahoe County mapping resources

Open ArapaMAP Assessor Tax Maps

How Arapahoe County 2025/2026 Property Values Were Set

Colorado real property is reappraised on a biennial cycle. The 2025 and 2026 Arapahoe values share the current reassessment framework rather than being newly reset every calendar year.

Residential value

The Assessor FAQ states that values used for 2025 and 2026 residential property are based on qualifying sales between July 1, 2023 and June 30, 2024, using the sales-comparison approach.

Broader appraisal data

The county assessment calendar states that the 2025/2026 assessment roll uses cost, market and income data collected between July 1, 2022 and June 30, 2024. Residential property uses the market approach.

Valuation date: when reviewing a 2026 real-property value, focus on what the property was worth under the county’s applicable June 30, 2024 valuation framework—not what a listing website says the home might sell for today.

Comparable-sale checklist

Similar neighborhood or market area.
Similar property type and design.
Comparable living area and lot characteristics.
Similar age, quality, condition and amenities.
Sale falls within the relevant county valuation period.
Differences are explained rather than ignored.

Arapahoe County 2026 Property Dates and Deadlines

January 1, 2026 — assessment status date

Taxable property is listed and valued according to its status for the applicable assessment year.

March 2, 2026 — first-half payment

For 2025 property taxes payable in 2026, the County confirmed March 2 as the adjusted first-half payment date.

April 30, 2026 — full property-tax payment

Taxpayers paying the annual 2025 tax bill in one payment had through April 30.

May 1–June 8, 2026 — real-property protest

The Assessor’s 2026 real-property valuation protest window ran through June 8.

June 15, 2026 — second-half tax payment

The second installment of 2025 property taxes payable in 2026 was due June 15.

June 15–June 30, 2026 — business personal property protest

Business-personal-property valuation protests had a separate filing window ending June 30.

July 1, 2026 — disabled-veteran filing

Arapahoe County lists July 1 as the application deadline for the qualifying disabled-veteran exemption through the state veterans process.

July 15, 2026 — senior exemption filing

The standard senior property-tax exemption application deadline was July 15.

November 5, 2026 — 2025 tax lien sale

The Treasurer currently lists the online 2025 Tax Lien Sale for November 5, 2026.

As of August 12, 2026: the standard real-property protest, business-personal-property protest, senior exemption and disabled-veteran exemption dates listed above have passed. Do not submit an old form and assume it will apply for 2026; contact the responsible office about any late, next-year or statutory alternative process.

Arapahoe County Property Valuation Appeal for 2026

The standard 2026 Assessor protest window is closed, but understanding the process is still useful if you filed on time or need to prepare for a later appeal stage.

Real property

Residential, commercial and other buildings plus the land on which they sit used the May 1–June 8, 2026 Assessor protest window.

Business personal property

Machinery, equipment, furniture and similar taxable business assets used the June 15–June 30, 2026 appeal window.

Build a useful real-property case

Start with the Notice of Valuation.
Confirm PIN, AIN, classification and property characteristics.
State the value you believe is supportable.
Use sales from the relevant valuation period.
Explain differences in size, age, location, condition and amenities.
Document factual errors such as incorrect square footage or property features.
Keep photos, estimates or other condition evidence when relevant.
Keep a complete copy of anything submitted.

Do not argue only that taxes are high. The Assessor controls valuation and classification. Mill levies are established by taxing authorities, and the Treasurer collects the resulting tax.

After the Assessor decision

If you filed a timely protest and disagree with the Assessor’s determination, follow the instructions and deadline in the determination notice for the County Board of Equalization process. Further review after a CBOE decision can include the Colorado Board of Assessment Appeals, Arapahoe County District Court or binding arbitration, depending on the route and eligibility.

Do not substitute a generic web deadline for the date on your determination notice. Later appeal stages have strict filing requirements.

Official Arapahoe County valuation resources

Assessment Appeal Information Board of Equalization

Arapahoe County Property Tax Search and Payment

The Treasurer system can search real estate and personal-property tax information by PIN, AIN or address. State-assessed property requires PIN or AIN.

Open Tax Search

Use the official Treasurer search rather than the Assessor Parcel Search when your question is about payment, tax balance or receipt.

Search by PIN, AIN or simplified address

PIN and AIN are best for exact matches. For address search, use the number and street name without direction or street type.

Check the tax year carefully

In 2026, the current annual payment activity concerns 2025 property taxes payable in 2026.

Review payment status and interest

Because the regular 2026 payment deadlines have passed, the amount due can include statutory interest. Use the live Treasurer record rather than an old tax card.

Save the receipt

The Treasurer FAQ explains that current-year receipts can be retrieved from the tax record after opening the appropriate PIN and payment date.

Current online payment fees

Method	Current published fee	Useful note
ACH / eCheck	No fee	A returned electronic payment currently carries a $20 return-payment fee.
Credit card	2.40%	Confirm the displayed charge before submitting.
Visa / Mastercard debit	$3.95	Other card treatment can differ; verify at checkout.
PayPal / Venmo / Apple Pay / Google Pay	2.40%	Current Treasurer FAQ lists these wallet options.

Online-payment timing: the Treasurer FAQ currently says first-half, second-half and full payments may remain available electronically through September 30 with applicable interest when paid after their original deadlines.

After September 30: delinquent real-estate payments approaching the tax-lien sale can require cleared funds. Always use the live Treasurer instructions at that stage.

Official Arapahoe County Treasurer Search Tax Bill / Pay

How Arapahoe County Property Taxes Are Calculated

Colorado property tax is not calculated by applying the mill levy directly to the full market value. First, the applicable assessment rate converts actual value to assessed value.

Actual Value − Applicable Exemption
× Assessment Rate
= Assessed Value

Assessed Value × Mill Levy ÷ 1,000
+ Special Assessments
= Approximate Property Tax

2025 residential tax calculation payable in 2026

Arapahoe County explains that beginning with tax year 2025, residential property uses two assessment rates:

6.25%

Used to calculate residential assessed value for local-government entities such as county, city, fire, water and similar districts.

7.05%

Used to calculate residential assessed value for school-district taxation.

Worked illustration

Assume a hypothetical home has a $500,000 taxable actual value, a hypothetical 60-mill combined non-school levy and a hypothetical 40-mill school levy.

Local assessed value: $500,000 × 6.25% = $31,250
$31,250 × 60 ÷ 1,000 = $1,875

School assessed value: $500,000 × 7.05% = $35,250
$35,250 × 40 ÷ 1,000 = $1,410

Illustrated total before special assessments = $3,285

This is not an Arapahoe County tax quote. Each property can be inside a different mix of school, city, fire, water, sanitation, recreation, metro and other districts, and special assessments can be added separately.

Arapahoe County Senior and Veteran Property Tax Exemptions

Colorado’s senior and qualifying disabled-veteran programs can exempt 50% of the first $200,000 of actual value of an eligible primary residence.

Program	Basic 2026 eligibility signal	2026 deadline
Senior Property Tax Exemption	At least one qualifying owner is age 65 or older as of January 1 and has owned/occupied the home as a primary residence for at least 10 consecutive years before January 1.	July 15, 2026
Veteran with a Disability	Qualifying veteran under Colorado disability and primary-residence rules.	July 1, 2026
Eligible surviving spouse	Certain qualifying surviving spouses can be covered under applicable senior/veteran provisions.	Use the current program form and state/county instructions.

2026 senior example: Colorado’s state guidance says a new senior-exemption applicant for 2026 generally must have been born on or before January 1, 1961 and have owned and occupied the home continuously as the primary residence since January 1, 2016 or earlier.

Current-date warning: July 1 and July 15 have passed. Do not rely on an old downloaded form without first asking whether a late, next-year or different qualification route is available.

Official exemption information

Senior Exemption Veteran Exemption

What Happens if Arapahoe County Property Taxes Are Not Paid?

A Colorado tax-lien sale does not mean a bidder immediately becomes the property owner.

Taxes become delinquent

Statutory interest and applicable charges accrue after the payment deadline.

The Treasurer sends delinquency notices

The Treasurer describes delinquent notices after the regular second-half payment period.

An unpaid real-estate tax lien can be sold

Arapahoe County currently schedules its 2025 Tax Lien Sale for November 5, 2026.

The investor holds a lien—not immediate ownership

The investor pays the delinquent taxes and receives the tax lien subject to Colorado redemption and deed procedures.

The owner can redeem

The county explains that a real-estate tax lien generally must be at least three years old before the holder can begin the Treasurer’s Deed process.

Treasurer’s Deed requires an additional process

Notice, title research and statutory procedures occur before a deed can ultimately be issued if the property is not redeemed.

Paying someone else’s ordinary tax bill does not automatically transfer ownership. A tax-lien investment and later Treasurer’s Deed process are separate statutory procedures.

Official Treasurer tax-lien information Review Tax Lien Sale Rules

Arapahoe County Deed and Recorded Property Search

Use the Clerk & Recorder when you need the legal document behind a transfer, lien, release or other recorded real-estate event.

Identify the parcel first

Search by property address and save PIN, AIN and the owner information displayed by the Assessor.

Open the Official Record Search

Choose real-property records and search the index.

Search by useful recording information

The current system supports grantor/grantee, subdivision, document type or document number searches.

Match the document to the property

Compare parties, recording date, document type, subdivision/legal information and other available identifiers.

Order the copy type you need

Use a normal copy for routine research and certified copies when an agency, lender, court or legal process specifically requires certification.

Current recorded-document copy fees

Copy	Current fee
Non-certified recorded-document copy	$0.25 per page
Certification	Add $1 per document
Online purchase credit-card fee	Add $2 per transaction
Recording a typical letter/legal-size document	$43 flat recording fee under the current schedule

Free fraud-monitoring option: Arapahoe County’s Property Alert is free. It can notify registered users when future documents matching the monitored name are recorded.

Official Clerk & Recorder

Search Official Records Recorded Document Fees Property Alert Information

New Arapahoe County Property Owner Checklist

Assessor record

Search the property address.
Save the PIN and AIN.
Review owner and mailing information.
Check actual and assessed values.
Verify property classification and characteristics.
Review sales and parcel-map context.

Tax and title record

Confirm the recorded deed.
Check the Treasurer account for unpaid taxes.
Confirm whether a mortgage company will pay taxes through escrow.
Review senior/veteran eligibility when applicable.
Save tax-payment receipts.
Register for Property Alert if useful.

Arapahoe County Property Search Not Working? Try These Fixes

Problem	Likely reason	Best next step
No address result	Too much address formatting.	Remove direction and street type; use number plus at least the first three street-name letters.
Too many addresses	Partial street name is broad.	Add the exact house number, number range or unit.
PIN rejected	Missing leading zeroes or extra punctuation.	Enter the numeric PIN exactly as shown; Arapahoe PIN examples begin with 03.
AIN rejected	Hyphens, leading zeros or account type format are wrong.	Copy the AIN exactly using the correct RE, PP or SA pattern.
Cannot find real estate by owner name	Main real-estate search does not present an owner field.	Search by address/PIN/AIN; for deed-party research, use Clerk & Recorder.
Business owner name gives no match	Business, LLC or legal owner spelling differs.	Use a partial name, then narrow with address or account identifier.
Tax amount does not match actual value	Actual value is converted to assessed value, then multiple mill levies and special assessments apply.	Open the Treasurer tax detail and review assessed values, rates and special assessments.
2026 tax due date seems already passed	The current bill is 2025 taxes payable during calendar year 2026.	Use the live Treasurer balance, which can include statutory interest.
Owner changed recently	Recording, Assessor and Treasurer systems update at different times.	Confirm the recorded deed first, then ask Assessor staff about ownership-record processing.
GIS boundary conflicts with fence	GIS is not a legal survey.	Review recorded documents and obtain a survey for legal boundary decisions.

Arapahoe County Assessor, Treasurer and Recorder Contacts

Have the address, PIN, AIN, tax year and relevant notice or recording information ready before contacting the office.

Office	Use it for	Current published information
Assessor — Littleton	Value, classification, real/property records, ownership changes, research and exemptions.	5334 S. Prince St., Littleton, CO 80120 303-795-4600 Mon–Fri, 8 a.m.–4 p.m.
Assessor — Altura Plaza	Assessor customer service, ownership changes, exemption help and property research.	15400 E. 14th Place, Suite 500, Aurora, CO 80011 303-795-4600 Mon–Fri, 8 a.m.–4 p.m.
Treasurer	Tax statements, payments, receipts, delinquency and tax-lien questions.	5334 S. Prince St., Littleton, CO 80120 303-795-4550 Mon–Fri, 8 a.m.–4 p.m.
Clerk & Recorder — Recording	Deeds, liens, releases, recorded documents and copies.	Recording help: 303-795-4520 Littleton: 5334 S. Prince St. Current branch hours: Mon–Fri, 8 a.m.–4 p.m.; recording in-person services require appointment.

Assessor call script

“I am calling about PIN [number] / AIN [number]. I need help with the 2026 [value / classification / owner record / exemption]. The property address is [address].”

Treasurer call script

“I am calling about PIN [number] for 2025 taxes payable in 2026. I need to confirm the [balance / payment / receipt / interest / tax-lien] status.”

Recorder call script

“I need a recorded real-estate document. I have the [grantor/grantee name / document number / subdivision] and approximate recording date. I need help locating the correct record or copy.”

Official Assessor office information Check Assessor Locations

Before You Rely on an Arapahoe Property Record

The street address matches the intended property.
The PIN and AIN match your notice or tax account.
You know whether the record is real estate, personal property or state-assessed property.
The owner display is not being mistaken for a title opinion.
Actual value and assessed value are not being treated as the same number.
The tax year is correct.
The current Treasurer balance is checked separately.
The map is being used as a research tool, not a legal survey.
The recorded deed is checked when legal ownership matters.
A deadline is confirmed from the current official notice before filing.

Official Arapahoe County Property Links by Task

Use these after you understand which office controls the record. They are for the final live search, payment, map research or recorded-document action.

Real property

Search residential, commercial, agricultural and vacant parcels by AIN, PIN or address.

Parcel Search

Business property

Search business personal property by AIN, PIN, address or owner name.

Business Property Search

Property taxes

Find tax detail, balances, payment options and receipts.

Treasurer Tax Search

Parcel map

Use the county GIS map for spatial and parcel context.

ArapaMAP

Assessment appeals

Review real and business personal property valuation protest information.

Assessor Appeals

Recorded documents

Search grantor/grantee, subdivision, document type and document number.

Official Record Search

Arapahoe County Assessor Property Search FAQs

What is the official Arapahoe County assessor property search?

The official real-estate search is Arapahoe County Parcel Search. It supports real-property lookup by AIN, PIN and address for residential, commercial, agricultural and vacant parcels.

Can I search Arapahoe County property records by address?

Yes. Enter the address number or number range and street name. The county advises leaving out street direction and street type, and the street-name field can work with at least the first three letters.

Can I search Arapahoe County real estate by owner name?

The main real-estate Parcel Search currently presents AIN, PIN and address fields rather than a general owner-name field. Search the known address or parcel identifier and review the resulting owner record. For recorded deeds by party name, use the Clerk & Recorder search.

Can I search Arapahoe County business personal property by owner name?

Yes. The separate Business Personal Property Search includes an Owner Name field and says a partial name may be used when the spelling is uncertain.

What is the difference between an Arapahoe County PIN and AIN?

Both are property-account identifiers used by county systems. The county’s PIN examples are numeric and begin with 03. Real-estate AINs use a formatted pattern such as 0000-00-0-00-000. Enter all required leading zeroes and follow the formatting shown by the search field.

Where can I find an Arapahoe County parcel map?

Use the official ArapaMAP GIS application or the Assessor Tax Maps resources. Find the property in Parcel Search first and save its PIN and AIN before opening the map.

What was the Arapahoe County 2026 property appeal deadline?

The 2026 real-property Assessor appeal window was May 1 through June 8. The separate business-personal-property appeal window was June 15 through June 30.

When were Arapahoe County property taxes due in 2026?

The current annual taxes paid during 2026 are 2025 property taxes. Arapahoe County confirmed a March 2, 2026 first-half deadline, April 30 full-payment deadline and June 15 second-half deadline. A current unpaid balance can include statutory interest.

Who qualifies for the Arapahoe County senior property tax exemption?

A qualifying senior owner must generally be at least 65 by January 1 and have owned and occupied the home as the primary residence for at least 10 consecutive years before January 1. The program exempts 50% of the first $200,000 of actual value when approved. The standard 2026 application deadline was July 15.

Does an Arapahoe County tax lien sale immediately transfer ownership?

No. A tax-lien purchaser acquires the lien, not immediate ownership of the property. Arapahoe County explains that a real-property tax lien generally must be at least three years old before the lien holder can begin the Treasurer’s Deed process, and the owner can redeem according to the applicable rules.

Use PIN and AIN as Your Arapahoe Property Keys

For most real-estate searches, start with the address once, save the PIN and AIN, and use those exact identifiers for future assessment, tax and map research. If you are searching a business owner, switch to Business Personal Property Search; if you need a deed-party name, switch to the Recorder.

Because the main 2026 valuation and exemption deadlines have already passed, use the current official notice or office guidance before attempting a late filing. For unpaid taxes, check the Treasurer’s live balance rather than calculating interest yourself.