Stage 2 Fire Restrictions Enacted for Western Boulder County; Stage 1 Fire Restrictions Enacted for Eastern Boulder County.

Boulder County government offices closed Friday, July 3. Trailheads close at 7:30 p.m. on July 4 and reopen at sunrise on July 5.

Wildfire smoke is causing poor air quality. Learn more

Assessor A-Z

Assessor A-Z

General

Address Change

Assessor/Treasurer’s Address Change Form

Agricultural Property

Appeals

Abatements

Appeals Calendar

Notice of Determination

El Proceso de Apelación

Remote Locations and Dates

Assessment and Valuation

Assessment Abstracts

Assessment Calendar

Mass Appraisal

Notice of Valuation

BPP NOV

Real Property NOV

Property Tax Calculation

Property Valuation Process

Business Personal Property

BPP Declarations

Certification of Values to Taxing Entities

Commercial Property

Income and Expense Questionnaire

Possessory Interest

Exemptions

Disabled Veterans Tax Exemption

Qualified Senior Primary Residence

Senior Tax Exemption

Foreclosures

Forms

Glossary

Mill Levies and Taxing Districts

Mobile Homes

Manufactured Homes FAQ

Possessory Interest

Property Sales and Data

Property Sales

Data Download

Property Search

Property Search Help

Recent Sales

Sales Report Codes and Descriptions

Comparable Sales

Sorting Sales Data In Excel

2025/2026 Comparable Sales

2023/2024 Comparable Sales

2021/2022 Comparable Sales

Assessor Links

Contact Us

Assessor

Phone: 303-441-3530
Fax: 303-441-4996

Email

Mailing Address

P.O. Box 471
Boulder, CO 80306-0471

Hours

7:30 a.m. - 5 p.m.
Monday-Thursday
Closed Friday

Drop Boxes

Boulder, Lafayette, and Longmont

Boulder

1325 Pearl St., 2nd floor
Boulder, CO 80302
Hours: 7:30 a.m. - 5 p.m.
Monday-Thursday

Longmont

515 Coffman St., Suite 114
Hours: 7:30 a.m. - 5 p.m.
Monday only

Lafayette

1755 S Public Road
Hours: 7:30 a.m. - 5 p.m.
Tuesday only

Website

BoulderCountyAssessor.gov

County logo