Assessor’s Office

Assessor's Office

Business Personal Property

Senior Tax Exemption

Join Boulder County Assessor Cynthia Braddock and Boulder County Treasurer Paul Weissmann for Senior Services Community Meetings. See details and dates.

The Colorado Constitution establishes a property tax exemption for qualifying senior citizens, surviving spouses of senior citizens 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 the following year.

Valuation Appeals—Notice of Determination

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.

Ask a Question about Your Property

Property Value Appeals were accepted May 1 through June 1, 2017

The Assessor’s Office will mail Notices of Determination to property owners who filed on-time appeals at the end of August, 2017. Property owners will have until September 15, 2017 to appeal their determination to the Board of Equalization.

Information Collection

The Assessor’s Office gathers and maintains information on properties, including:

  • Ownership
  • Location
  • Use
  • Sales
  • Building measurements
  • Construction type
  • Construction costs
  • Rental income, if applicable

Sources for this information are:

  • Real property deeds and declarations
  • Subdivision maps
  • Building permits
  • Local building contractors
  • Property owners
  • Declarations filed by owners of taxable personal property
  • Onsite inspections by staff

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
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