Some county buildings are reopening to the public on June 1, while other services remain online. See current safer-at-home order with face coverings.

Resources are available for those impacted by COVID-19. For help, submit questions or call 720-776-0822 weekdays (9 a.m.-5 p.m.).

Level 1 Fire Restrictions remain in place for western Boulder County. View the flyer and map for more details. No fires, no shooting.

Assessor’s Office

Assessor's Office

News & Information

Assessor’s Office Status

All Assessor’s Office locations (the main location in Boulder as well as remote offices in Longmont and Lafayette) are closed to walk-in traffic until further notice.

Staff are available online and by phone during regular business hours to take your questions or schedule appointments. Please call 303-441-3530, or email

Property Value Appeals were accepted May 1 through June 1, 2020

The Assessor’s Office will mail Notices of Determination to property owners who file on-time appeals on or before September 16, 2020. Property owners will have until September 28, 2020 to appeal their determination to the Board of Equalization.

Business Personal Property Declaration Deadline Extended

Online filing opened Feb. 1, and is available to businesses who received a postcard in lieu of a full declaration. Deadline for filing declarations has been extended to June 15. For more information…

Treasurer’s Tax Payment Delay Policy

Senior Homestead Property Tax Exemption

The Colorado Constitution establishes a property tax exemption for qualifying older adults, surviving spouses of those who previously qualified, and for disabled veterans. Applications must be filed no later than July 15 for the exemption to apply to your tax bill next year.

Services and Information


The Assessor’s Office establishes values every two years for more than 120,000 properties within Boulder County, worth nearly $50 billion in market value, using tools such as geographic information systems (GIS) and mass appraisal techniques to perform the appraisal analysis. Property values are used to set tax amounts which the Treasurer’s Office administers and collects.

Connect With Us

Contact Us

Due to COVID-19, all Assessors Office sites are closed for business until Sunday, May 31. Please call or email us with your questions during our normal business hours.

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

Business Personal Property
Phone: 303-441-3316
Fax: 303-441-1783


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Mailing Address
Main: PO Box 471
Boulder, CO 80306-0471

1325 Pearl St., 2nd floor
Boulder, CO 80302
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Hours: 8 a.m.-4:30 p.m. M-F

515 Coffman Street, Suite 114
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1376 Miners Dr., Unit 105
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