Assessor’s Office

Assessor's Office

The Assessor’s Office has Moved (Temporarily)…

To 1333 Iris Avenue

from late summer 2018
to early January 2019…

To accommodate our downtown Boulder office reconstruction project.
Temporary Location (starting August 27): 1333 Iris Ave. at the southeast corner of Boulder County’s North Broadway campus (see map).
Temporary Location Map

Hours will remain the same:
Monday through Friday, 8 a.m. to 4:30 p.m.
Please call our office at (303) 441-3530 with any questions.

For more information, please see our news release.

Business Personal Property

Property Information, Mapping, & Data

Property Search

Property Data Download

Records Policies

Comparable Property Sales

Recent Sales

  • Recent Sales Activity—lists of sales for specified time frames. These lists are not intended to be used for real property assessment appeals.

Real Property Value Appeals were accepted May 1 through June 1, 2018

The Assessor’s Office will mail Notices of Determination to property owners who filed on-time appeals at the end of August, 2018. Property owners will have until September 15, 2018 to appeal their determination to the Board of Equalization.

Valuation Appeals—Notice of Determination

Ask a Question about Your Property

Senior Tax Exemption

The Colorado Constitution establishes a property tax exemption for qualifying senior citizens, surviving spouses of senior citizens who previously qualified, and for disabled veterans.

The deadline for Senior Exemption applications for the 2018 tax year was July 15.

Learn more about:

Assessor Logo

Cynthia Braddock, Assessor
Cynthia Braddock
Meet the Assessor

Valuing Property

The Assessor’s Office establishes values every two years for more than 120,000 properties, worth nearly $50 billion in market value. The agency uses tools such as geographic information systems (GIS) and mass appraisal techniques to perform appraisal analysis.

The Assessor discovers and lists information about properties and uses this information to determine property values.

Property Assessment Overview

How Property Taxes Are Calculated

Contact Us


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

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

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



1325 Pearl St., 2nd floor
Boulder, CO 80302
Map & Directions
Temporary Location
starting August 27, 2018

1333 Iris Avenue
Map & Directions
Hours: 8 a.m.-4:30 p.m. M-F


515 Coffman Street, Suite 114
Map & Directions
Hours: 8 a.m.-4:30 p.m.
Mondays ONLY


1376 Miners Dr., Unit 105
Map & Directions
Hours: 8 a.m.-4:30 p.m.
Tuesdays ONLY