Starting Jan. 1, the minimum wage in unincorporated Boulder County is $15.69/hour.

A partir del 1 de enero, el salario mínimo local en la zona no incorporada del condado de Boulder será de $15,69/hora.

Assessor’s Office
Boulder Valley farmland landscape, with mountains to the right

Boulder County Assessor’s offices will be closed on Thursday, Nov. 30

Offices will reopen Monday, Dec. 4, at 7:30 a.m.

On Thursday, Nov. 30, all Boulder County Assessor’s offices will be closed for employee development. The offices will reopen on their regular schedule on Monday, Dec. 4, 7:30 a.m. The Assessor’s regular office hours are Monday – Thursday, 7:30 a.m. – 5 p.m., and closed on Fridays.

Onsite services will not be available on Nov. 30. We advise those who desire onsite service to either visit before closing time or on Monday, Dec. 4 or after. We will be returning phone messages left using 303-441-3530 and responding to emails send to Additionally, we encourage our Boulder County clients to visit and navigate to the appropriate department to see if the service they are seeking is available online.

Assessors Office

News & Information

Real Property Value Appeals were accepted May 1 through June 8, 2023
Business Personal Property Appeals were accepted June 15 through June 30, 2023

The Assessor’s Office will mail Notices of Determination to property owners who file on-time appeals on or before August 15, 2023. Property owners will have until September 15, 2023 to appeal their determination to the Board of Equalization.


The Assessor’s Office establishes values every two years for more than 120,000 properties within Boulder County, worth more than $120 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

Services & Information

Contact Us

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


Mailing Address
PO Box 471
Boulder, CO 80306-0471

Monday thru Thursday
Hours: 7:30 am–5 pm


Assessor Boulder & Longmont Drop Boxes

1325 Pearl Street, 2nd floor
Boulder, CO 80302
Monday thru Thursday
Hours: 7:30 am–5 pm
Map & Directions

515 Coffman Street, Suite 114
Monday ONLY
Hours: 7:30 am–5 pm
Map & Directions

1755 S Public Rd
Tuesday ONLY
Hours: 7:30 am–5 pm
Map & Directions