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

Assessors Office

News & Information

Business Personal Property Appeals are accepted June 15 through July 1, 2024

Real Property Value Appeals were accepted May 1 through June 10, 2024

The Assessor’s Office will mail Notices of Determination to property owners who file on-time appeals on or before August 15, 2024. Property owners will have until September 15, 2024 to appeal their determination to the Board of Equalization.

Senior Exemption Applications

Senior Exemption Applications are currently being accepted through July 15. Please visit the Senior Exemptions page to learn more.

Qualifying Veteran with a Disability Exemption & Gold Star Spouse Applications

Qualifying Veteran with a Disability and Gold Star Spouse Exemption Applications are currently being accepted through July 1. Please visit the Veteran Related Exemptions web page to learn more.

Assessor Overview

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

Assessor

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

Email

Mailing Address

PO Box 471
Boulder, CO 80306-0471

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

Locations

Assessor Boulder and Longmont Drop Boxes

Boulder

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

Longmont

515 Coffman St., Suite 114
Hours: 7:30 a.m. to 5 p.m.
Monday only
Map and Directions Longmont Location

Lafayette

1755 S Public Road
Hours: 7:30 a.m. to 5 p.m.
Tuesday only
Map and Directions Lafayette Location