Assessors Office

News and Information

Real Property Value Appeals are accepted May 1 through June 9, 2025

Map of 2025 Boulder County Residential Values

Senior Exemption Applications

Please visit the Senior Exemptions page to learn more.

Qualifying Veteran with a Disability Exemption and Gold Star Spouse Applications

Please visit the Veteran Related Exemptions web page to learn more.

Business Personal Property

Owners of taxable Business Personal Property in Boulder County as of January 1 are required to file a Business Personal Property Declaration every year.
The 2025 deadline to timely file a Business Personal Property Declaration is April 15.
File a Business Personal Property Declaration

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

• Assessor/Treasurer Change of Address form.
• Ask a question about your Business Personal Property. Appeals are accepted June 15–30 each year.
• Ask a question about your Real Property. Appeals are accepted May 1–June 8 each year.
• Ask a question about your Senior Exemption. Applications must be filed by July 15.
• Search for your Notice of Value (NOV) online.
• 2020 Assessor’s Office State of the County video.