Boulder County COVID-19 status is at Level Yellow. Information and vaccine updates are available in English and Spanish.

Assessor’s Office
To provide better public service, the Property Search site will be undergoing maintenance from January 13th to January 20th. You may experience intermittent outages. If so, please try again at a later time.

Assessor's Office

News & Information

Business Personal Property

Assessor’s Office New Hours

4 day week calendarThe Assessor’s Office is one of several Boulder County departments participating in a pilot program to explore moving to a four-day work-week.

Starting January 4, and running through March 31, 2021, the Assessor’s Office staff will be available Monday through Thursday, 7:30 a.m.–5:00 p.m. online and by phone, to take your questions or schedule appointments. Please call 720-574-1880, or email

Important Alert for Tax Notices and Ownership inquiries

We are currently processing documents that were recorded with the Boulder County Clerk & Recorder from September 2020. Ownership, Death Certificates, Quit Claim Deeds, etc. that have occurred since September 2020 may not be reflected in Property Search results. Thank you for your understanding and patience. This notice will be updated to reflect our progress.

If you receive a tax notice for a property you sold in 2020, please disregard it. Once the ownership records are updated, the new owner will be notified of the taxes due.

Assessor’s Office Status

coronavirus imageAll Assessor’s Office locations (the main location in Boulder as well as remote offices in Longmont and Lafayette) are closed to walk-in traffic until further notice.

Staff are available online and by phone during regular business hours to take your questions or schedule appointments. Please call 303-441-3530, or email

Services & Information


The Assessor’s Office establishes values every two years for more than 120,000 properties within Boulder County, worth nearly $50 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.

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Contact Us

Due to COVID-19, all Assessors Office sites are closed for business until further notice. Please call or email us with your questions during our normal business hours.

Phone: 720-574-1880
Fax: 303-441-4996

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


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

1325 Pearl St., 2nd floor
Boulder, CO 80302
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Hours: 7:30 a.m.–5 p.m. M–Th

515 Coffman Street, Suite 114
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1376 Miners Dr., Unit 105
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