Stage 1 fire restrictions for western Boulder county effective 11/30/21. See flyer, map, and news release for details.

Assessor’s Office

Assessor's Office

News & Information

Real Property Value Appeals were accepted May 1 through June 1, 2021
Business Personal Property Appeals were accepted June 15 through June 30, 2021

The Assessor’s Office will mail Notices of Determination to property owners who file on-time appeals on or before August 15, 2021. Property owners will have until September 15, 2021 to appeal their determination to the Board of Equalization.

Assessor’s Office New Hours

4 day week calendarThe Assessor’s Office is one of several Boulder County departments participating in a pilot program to explore moving to a four-day work-week.

Starting January 4, the Assessor’s Office staff will be available Monday through Thursday, 7:30 a.m.–5:00 p.m. online and by phone, to take your questions or schedule appointments. Please call 720-574-1880, or email

Assessor’s Office Status

All Assessor’s Office locations are open to the public.
Staff is still available online and by phone during regular business hours to take your questions or to schedule appointments. Please call 303-441-3530, or email

Services & 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

Phone: 303-441-3530 option 1
Fax: 303-441-4996

Business Personal Property
Phone: 303-441-3530 option 2
Fax: 303-441-1783


Schedule a meeting

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


Assessor Boulder & Longmont Drop Boxes

1325 Pearl St., 2nd floor
Boulder, CO 80302
Map & Directions
Hours: 7:30 a.m.–5 p.m. M–Th

515 Coffman Street, Suite 114
Map & Directions

1376 Miners Dr., Unit 105
Map & Directions