Find the Parcel, Value, Map and Tax Record
Boulder County’s official Assessor Property Search can find property by address, owner name, street name, subdivision, account number, parcel number or Section-Township-Range. You can also zoom into its GIS map and click a parcel directly.
Use this guide to understand every useful result section, troubleshoot owner/address searches, read 2026 values correctly, move from appraisal to taxes or deeds, and handle the current post-appeal-stage deadlines without confusing the Assessor with the Treasurer.
Fast Answer: Assessor, Treasurer or Clerk & Recorder?
Use the Boulder County Assessor for owner information, parcel details, actual and assessed values, building characteristics, comparable sales, valuation appeals and certain exemptions. Use the Treasurer for the actual property-tax account, payment history, current/delinquent tax charges and payments. Use the Clerk & Recorder for deeds, liens, plats and other recorded real-estate documents.
Choose the Correct Boulder County Property Tool
Owner, parcel, value or property characteristics
Use the Assessor Property Search for ownership display, situs address, account/parcel numbers, actual value, assessed value, building information, sales, comparisons and map context.
Official Boulder County Assessor Open Assessor SearchTax amount, payment history or delinquency
Use the Treasurer’s tax system for prior assessed values, payment records, current and delinquent charges, interest, abatements and special assessments.
Official Boulder County Treasurer Treasurer Tax ServicesMap, aerial image or location problem
The Assessor search itself includes an interactive parcel map, aerial imagery, measurement tools, coordinate search, graphic selection and survey-related information.
Official Assessor GIS application Use the GIS GuideDeed, lien, plat or recorded document
Use the Recording Division’s Public Search when you need the recorded document rather than the Assessor’s ownership/value record.
Official Boulder County Clerk & Recorder Recorded Document SearchHow to Search Boulder County Property Records
The official tool uses one search box plus its map. This sequence works whether you start with an address, owner name, parcel number or legal-location clue.
Open the official Assessor Property Search
Use Boulder County’s map-based property application rather than a third-party property database when you need the current county assessment record.
Enter the strongest search term you have
The county supports address, owner name, street name, subdivision, account number, parcel number or Section-Township-Range.
Select the correct autocomplete match
Choose the result that matches the property or search category instead of pressing through an unrelated similarly named owner, street or subdivision.
Confirm the parcel on the map
Match the property address, owner, account number, parcel number, subdivision and approximate map location before relying on the record.
Open the relevant expandable section
Review Basic Property Info, Assessment, Taxes, Sales History, Comparable Sales, zoning/septic, floodplain, surveys or other sections only as needed.
Save both account and parcel numbers
The account identifies the assessment account, while the parcel number identifies the land parcel. Keeping both makes tax, deed, appeal and map research much easier.
Boulder County Assessor Property Search by Address
Address searching is the fastest route for most homeowners, buyers and neighbors who do not yet know the parcel number.
Best first attempt
- Enter the property address in the main search bar.
- Wait for the possible matches to appear.
- Select the property that matches the correct location.
- Verify owner, account and parcel number after the property opens.
If the full address does not appear
- Search the street name by itself.
- Use the map and zoom into the expected location.
- Try the subdivision when you know it.
- Use an account or parcel number from an older notice or tax bill.
Boulder County Assessor Property Search by Name or Owner
The official Assessor tool supports owner-name searching. Treat the displayed owner as an assessment-record clue, then use the Recorder when legal title history matters.
Known owner
Enter the owner name in the Assessor search box and select the matching autocomplete result.
Too many similar names
Verify the property address, subdivision, account number and parcel number instead of relying on the name alone.
Need current deed/title evidence?
Use the Clerk & Recorder Public Search. The Recorder FAQ specifically explains that a newer current deed may exist before it appears in the Assessor mapping record.
Boulder County Parcel Number, Account Number and S-T-R Search
Identifier |
What it means |
Best use |
|---|---|---|
Account Number |
Assessor account identifier attached to the property/account record. |
Exact repeat lookup, appeal work, tax research and account-specific questions. |
Parcel Number |
A 12-digit number unique to a parcel of land; one parcel can be associated with more than one account/building situation. |
Parcel-specific GIS, land, survey and tax-record research. |
S-T-R |
Section-Township-Range location. |
Rural land and legal-location research when a normal street address is weak or unavailable. |
Reception Number |
Recorded-document number assigned by the Clerk & Recorder. |
Finding the deed or recorded document behind a sale. |
What the Boulder County Property Search Actually Shows
The portal is unusually deep. It combines Assessor data with multiple county information layers, so it is worth understanding what each section is—and is not.
Section / field |
What you can learn |
Important limit |
|---|---|---|
Basic Property Info |
Address, account number, parcel number, lot size, estimated acres, subdivision, neighborhood, market area, legal description, owner and mailing address. |
Assessment data does not replace a title opinion or survey. |
Value information |
Total actual value, land actual value, improvement/structure value and assessed-value information. |
Actual value is not the final tax amount. |
Building attributes |
Building count, design, square footage, floor areas, bedrooms/bathrooms and other stored characteristics. |
The Assessor record is not a building inspection. |
Taxes |
Estimated distribution by taxing authority using available current values and mill-levy data. |
The portal explicitly says not to pay from this estimate; use the Treasurer for taxes actually due. |
Sales History |
Recorded sales connected to the assessment account and deed-related information. |
Use the Recorder for the official recorded document. |
Comparable Sales |
Comparable-sale tool for residential properties. |
The portal notes this feature is for residential properties only. |
Zoning & Septic |
County zoning/septic-related context and permit/docket links. |
For property inside a municipality, contact that municipality’s planning department. |
Floodplain |
Mapped flood-hazard information for the parcel. |
County warns incorporated-area flood information should not be relied upon and map layers may not reflect every LOMA/LOMR. |
Surveys |
Survey-related parcel information, S-T-R-Q clues and links to survey/plat research. |
GIS land size is not survey quality. |
Boulder County Assessor Property Search Map and GIS Tools
The property search is also the Assessor’s parcel GIS tool. You can find a property without typing a name when you know approximately where it is.
Click a parcel
Zoom into the map and click the property. This is especially useful for vacant land, mountain parcels and addresses that do not autocomplete well.
Switch aerial imagery
The map’s basemap menu includes imagery. County guidance recommends Boulder County imagery because it can provide higher resolution than generic imagery.
Measure distance or area
The map includes measurement tools for orientation and research. Measurements should not be treated as a professional boundary survey.
Select parcels by graphic
Polygon, rectangle, circle and line tools can be used to select parcels that intersect a drawn shape.
Coordinate search
The map supports State Plane coordinates and several latitude/longitude formats, plus UTM.
Oblique imagery
After selecting a property, oblique imagery can provide angled views and historical image-year options. Return to the Home map to select a different parcel.
Why One Address Can Show Several Boulder County Accounts
The first letter of an Assessor account can help explain what kind of record you are seeing.
Starting letter |
General account type |
Common situation |
|---|---|---|
R |
Real property |
Land/buildings in fee-simple ownership, plus certain possessory-interest or severed-mineral records. |
P |
Business personal property |
Business equipment; several businesses can exist at the same location. |
M |
Manufactured home |
The manufactured home may have an M account while underlying land uses a separate R account. |
U |
State-assessed property |
Certain statewide organizations such as railroads, utilities or telecommunications property. |
Using Boulder County Property Search on a Phone
The official application is map-heavy, so mobile behavior can be less obvious than on desktop.
Scrolling the property sections
The county specifically tells mobile users to use the blank space on the right side of the screen to scroll through the expandable information sections.
Older device problems
Boulder County warns that older phones, tablets or computers may struggle with the application because of memory/resource limitations. A newer device may work better.
Boulder County Property Search Not Working? Try This
Problem |
Likely reason |
Best next action |
|---|---|---|
Address not found |
Search wording or address mismatch. |
Try street name, owner, subdivision, account, parcel or select the location on the map. |
Owner search returns many properties |
Common owner name. |
Verify property address, subdivision, account and parcel number before opening related records. |
Several records at one property |
Real property, BPP, manufactured-home or other account types may overlap geographically. |
Check the account prefix and property type before selecting a record. |
Map responds slowly |
Large condo/manufactured-home group or device/browser limitations. |
Wait for the first selection to finish; avoid repeated clicking and try a newer device if necessary. |
Map/data panels fail |
Cache or temporary service issue. |
Check Status and clear the browser cache. |
Estimated tax looks wrong |
The Assessor map displays an estimate based on available values/mill data. |
Use the Treasurer tax account for actual levied taxes and balances. |
Owner seems outdated |
A newer recorded deed may not yet be reflected in the Assessor layer. |
Search Clerk & Recorder records for a more recent deed. |
Boundary does not match fence |
GIS parcel geometry is approximate. |
Use recorded plats/deeds and a licensed surveyor for a legal boundary question. |
How Boulder County 2026 Property Values Work
Colorado generally revalues real property in odd-numbered years. That makes 2026 an intervening year following the 2025 reappraisal.
Boulder County used this 24-month sales period for the 2025/2026 valuation cycle, with June 30, 2024 as the appraisal date.
For a changed property in the intervening year, the Assessor values the property as it existed on January 1, 2026 while estimating probable market value as of June 30, 2024.
If condition and classification stayed the same, the 2026 value generally remains the same as the 2025 value.
A new 2026 Notice of Valuation may be sent after new construction, ownership/record changes or other qualifying changes in value/classification.
Boulder County 2026 Property Appeal: Current Status
The Assessor-level 2026 real-property appeal period is over. Owners who filed on time are now waiting for or reviewing the Notice of Determination.
If you filed by June 8
- Watch for the Assessor’s Notice of Determination.
- The current county page says determinations will be mailed on or before August 15.
- Review the new value/classification and explanation.
- Prepare for the Sept. 15 BOE deadline if you still disagree.
If you missed the normal appeal
The regular June 8 protest period has closed. Boulder County also has an abatement process for certain erroneous/illegal tax situations, subject to eligibility and timing rules.
Do not treat abatement as an automatic replacement for a missed normal appeal.
Strong appeal evidence
- Your opinion of the correct value.
- A short explanation of why the Assessor value is incorrect.
- Comparable properties with addresses, sale prices and sale dates.
- Corrections to square footage, bathrooms, finished basement, lot size, condition or improvements.
- Photos or documents supporting factual corrections.
- Sales from the July 1, 2022–June 30, 2024 base period when available.
September 15, 2026: Board of Equalization Next Step
A property owner who timely appealed to the Assessor and disagrees with the Notice of Determination may continue to the Boulder County Board of Equalization.
BOE eligibility
You must first have appealed at the Assessor level and received a Notice of Determination before using the BOE process.
2026 filing deadline
September 15, 2026. Boulder County says late BOE appeals are rejected without review.
BOE practical rules
- All hearings are held remotely by Microsoft Teams video or phone.
- Hearings may not be rescheduled or postponed.
- A current valid email address is important because BOE communication is by email.
- Use the account/schedule number on all appeal documents and email subjects.
- Evidence filed with the Assessor is not automatically transferred to the BOE.
- Representatives need the required Letter of Agency.
- The BOE can leave value unchanged, reduce it or consider an Assessor-supported increase.
Boulder County Tax Assessor Property Search vs Treasurer Tax Search
The Assessor property page can show estimated tax distribution, but Boulder County explicitly warns users not to pay from that estimate.
Assessor Property Search
- Current property value information.
- Assessment rates/value context.
- Estimated tax distribution by authority.
- Property characteristics.
- Comparable residential sales.
Treasurer Tax Account
- Prior assessed property values.
- Record of payments.
- Current and delinquent tax charges.
- Interest and abatement charges.
- Special assessments.
- Statements/reports and electronic tax notices.
Taxes being paid during calendar year 2026
2025 taxes payable in 2026 |
Official due date |
|---|---|
First half |
March 2, 2026 |
Full payment |
April 30, 2026 |
Second half |
June 15, 2026 |
Online payment fees
Method |
Current published fee |
|---|---|
Online e-check |
No service charge. |
Credit card |
3.29%, minimum $5.20. |
Debit card |
1.33%, minimum $1.45. |
2026 Boulder County Assessment Rates: Taxes Payable in 2027
Boulder County’s tax-calculation page publishes separate 2026 assessment rates by property type. These rates affect tax year 2026, which is payable in 2027.
Property type |
2026 assessment rate |
2026 value adjustment |
|---|---|---|
Residential — school districts |
7.05% |
$0 |
Residential — local government |
6.8% |
10% of the first $700,000 in actual value |
Business Personal Property |
26% |
$0 |
Agricultural |
25% |
$0 |
Commercial |
25% |
$0 |
Industrial |
26% |
$0 |
Vacant land |
26% |
$0 |
Boulder County Senior Property Tax Exemption: August 2026 Status
The Senior Homestead Property Tax Exemption is handled through the Assessor. The regular July 15 deadline has passed, but the county currently allows late senior applications through August 15.
2026 senior eligibility basics
- Born on or before January 1, 1961.
- Lived in the home as primary residence continuously since before January 1, 2016.
- Owned the home continuously since before January 1, 2016.
Exemption amount
For qualifying owners, 50% of the first $200,000 in actual value is exempt, for a maximum $100,000 reduction in actual value subject to the program rules.
The 2026 exemption first appears on the tax bill sent in 2027.
Boulder County Property Records: Deeds, Liens and Plats
The Assessor helps identify a property and its most recent assessment-related deed information. The Clerk & Recorder maintains the official recorded-document index.
Find the parcel in Assessor Property Search
Save the owner, account, parcel number, legal-description clues and any deed/reception information shown in Sales History.
Open Recording Public Search
The Recording Division makes document type, recording information, grantor/grantee names and legal descriptions available through its public records search.
Match the recorded document
Use the party names, reception/document information, recording date and legal-description clues to distinguish similar records.
View or order the copy you need
The county provides free watermarked images for viewing/downloading/printing. Non-watermarked or certified copies can be ordered when needed.
Use title or legal help for legal conclusions
The Recorder records documents but does not decide whether a document is legally valid or resolve competing ownership claims.
Recorded document types
- Deeds.
- Deeds of trust.
- Liens.
- Plats and maps.
- Covenants.
- Foreclosure documents.
- UCCs.
Free Property Alert
The Clerk & Recorder offers a free Property Alert email service that can notify registered users when documents matching their monitored property/name are recorded.
Property AlertBoulder County Assessor, Treasurer and Recorder Contacts
Office |
Use it for |
Current details |
|---|---|---|
Boulder County Assessor |
Property search, values, characteristics, appeals and exemptions. |
303-441-3530 assessor@bouldercounty.gov 1325 Pearl St., 2nd Floor, Boulder Mon–Thu 7:30 a.m.–5 p.m.; closed Friday |
Assessor — Longmont |
Limited Assessor services. |
515 Coffman St., Suite 114 Monday only 7:30 a.m.–5 p.m. |
Assessor — Lafayette |
Limited Assessor services. |
1755 S Public Road Tuesday only 7:30 a.m.–5 p.m. |
Boulder County Treasurer |
Tax statements, payments, delinquency and tax-account questions. |
303-441-3520 1325 Pearl St., 1st Floor, Boulder Mon–Fri 8 a.m.–4:30 p.m. |
Clerk & Recorder — Recording |
Deeds, liens, plats and recorded-document copies. |
303-413-7770 recording@bouldercounty.gov 1750 33rd St., Suite 201, Boulder Mon–Thu 7:30 a.m.–5 p.m.; closed Friday |
Assessor call script
Treasurer call script
Recorder call script
Need More Than One Property? Download Boulder County Assessor Data
Researchers, analysts and professionals do not have to search parcels one at a time. Boulder County publishes bulk public Assessor datasets refreshed daily.
Owner and address data
Download owner/address and account/parcel datasets for broader property research.
Values and buildings
Separate downloads cover property values, buildings, land and permits.
Sales and GIS
The county also publishes sales data, tax areas/authorities and downloadable GIS parcel boundaries.
Before You Rely on a Boulder County Property Record
- The owner/address result matches the intended parcel.
- You saved both the account number and parcel number.
- You identified whether the account is R, P, M or U when multiple records exist.
- You are reading the correct tax/valuation year.
- A 2026 intervening-year value has not been mistaken for a brand-new countywide reappraisal.
- The Assessor’s estimated taxes have not been treated as the Treasurer’s actual amount due.
- GIS land size and boundaries have not been treated as survey-quality data.
- Municipal zoning/flood questions have been confirmed with the correct jurisdiction.
- A deed/title question has been checked through recorded documents.
- A 2026 appeal has been checked against the current Aug. 15 / Sept. 15 timeline.
Official Boulder County Property Tools
Use these after the guide has identified the record or action you need.
Assessor Property Search
Address, owner, street, subdivision, account, parcel, S-T-R and GIS map.
Property SearchProperty Search Help
Use when the map/search application behaves unexpectedly or you need search guidance.
Search Help2026 Appeals
Current Assessor valuation appeal information and deadlines.
Appeal InformationBoard of Equalization
Next-stage appeal after an Assessor Notice of Determination.
BOE AppealProperty Tax
Tax lookup, payment options, current balance and Treasurer help.
TreasurerRecorded Documents
Deeds, liens, plats, covenants and other Recording Division records.
Public Records SearchBoulder County Assessor Property Search FAQs
What is the official Boulder County Assessor property search?
The official Boulder County Assessor Property Search is the county’s map-based property application. It supports searching by address, owner name, street name, subdivision, account number, parcel number or Section-Township-Range, and you can also select a parcel directly from the map.
Can I search Boulder County property by address?
Yes. Enter the address in the Assessor Property Search and select the correct autocomplete result. If it does not appear, try the street name, owner, subdivision, account number, parcel number or locate the property directly on the map.
Can I search Boulder County property by owner name?
Yes. Owner name is one of the official search options. After finding a match, confirm the situs address, account number and parcel number so you do not rely on the wrong similarly named owner.
What is the difference between a Boulder County account number and parcel number?
The account number identifies an Assessor account, while the parcel number identifies a parcel of land. Boulder County’s published data definitions describe the parcel number as a 12-digit number unique to each parcel, although one parcel/location can be associated with multiple account types.
What can I see on the Boulder County property map?
The map supports parcel selection, aerial imagery, distance/area measurements, coordinate searching, graphic parcel selection and property information. Selected records can also lead to assessment, sales, zoning, floodplain, survey and other county information.
Is the Boulder County Assessor GIS map a legal survey?
No. Boulder County states that GIS land-size and parcel information are not survey quality. Use recorded plats and a Colorado licensed professional land surveyor for legal boundary questions.
Why did I not receive a new 2026 Notice of Valuation?
2026 is an intervening year. For most properties whose condition and classification did not change, the value remains the same as 2025. A new 2026 Notice of Valuation is generally sent when the property had a qualifying change.
What is the 2026 Boulder County property appeal deadline?
The regular Assessor-level real-property appeal period ran from May 1 through June 8, 2026 and is closed. On-time appellants should receive a Notice of Determination on or before August 15 and may have until September 15 to continue to the Board of Equalization.
Where do I look up or pay Boulder County property taxes?
Use the Boulder County Treasurer for the actual tax account, payment history, current or delinquent charges and payments. Do not pay from the estimated-tax amount shown in the Assessor Property Search.
Where can I find Boulder County deeds and recorded property documents?
Use the Boulder County Clerk & Recorder Recording Division Public Search for deeds, liens, plats, covenants and other recorded documents. Free watermarked document images can be available for viewing, while other copy or certification options may have fees.
Best Search Route for Boulder County
Start with the Assessor’s map-based Property Search. Use an address or owner name when that is all you know, but save the account and parcel numbers once the correct property opens. Those identifiers make every later step—tax lookup, appeal, recorded-document research and map verification—much easier.
Use the Assessor for value and property facts, the Treasurer for the amount actually due, and the Clerk & Recorder for deeds and legal recorded documents.
Find the Right Property Record, Tax Bill, Deed or Assessor Search Route
Use this helper before searching county property records. It helps you choose the right office, prepare the right details, avoid wrong-office mistakes, and review property records safely.
Property Search Route Finder
Choose what you have and what you want to find. The tool will suggest the best search route and common mistake to avoid.
Parcel / APN / PIN Format Helper
Parcel numbers are formatted differently by county. Try these variations if your official search does not return results.
Assessor, Tax Collector, Recorder or GIS?
Select your issue and this tool will show the office that usually handles it.
Simple Property Tax Estimate Helper
This is a general estimate only. State and county tax rules differ, so always verify final bills with the official tax collector, treasurer or county tax office.
Exemption / Appeal Readiness Checklist
Use this before applying for an exemption or challenging a value. Missing proof is one of the biggest reasons users waste time or miss deadlines.
Property Record Review Checklist
Review these fields before relying on any assessor, appraiser, auditor, property appraiser, tax or deed record.