Boulder County government offices are closed Monday, May 29, in observance of Memorial Day.

If you have questions about property valuation and property tax, visit boco.org/2023Valuation.

2021 Time Trend Adjustments

2021/2022 Comparable Sales

Using Time Trending for Property Valuation

Residential Time Trends July 1, 2015 through June 30, 2020

Market Area Factor Tables
2021 Apartment Time Trends
Market Areas: 640, 641, 642, 643, 644, 645
PDF XLSX
2021 Condominium Residential Time Trends
Market Areas: 630, 632, 633, 634
PDF XLSX
2021 Boulder Residential Time Trends
Market Areas: 101, 102, 103, 104, 105, 106, 107, 108, 109
PDF XLSX
2021 Erie, Gunbarrel, Lafayette, Louisville, Niwot, & Superior Residential Time Trends
Market Areas: 401, 402, 403, 404, 405, 407, 501
PDF XLSX
2021 Longmont Residential Time Trends
Market Areas: 502, 503, 504, 505, 506, 507
PDF XLSX
2021 Mountain Residential Time Trends
Market Areas: 201, 202
PDF XLSX
2021 Unincorporated Plains Residential Time Trends
Market Areas: 301, 302, 303, 304
PDF XLSX

Contact Us

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

Email

Mailing Address
PO Box 471
Boulder, CO 80306-0471

*New as of Jan 4, 2021*
Monday thru Thursday
Hours: 7:30 am–5 pm
CLOSED Friday

Locations

Assessor Boulder & Longmont Drop Boxes

Boulder
1325 Pearl Street, 2nd floor
Boulder, CO 80302
Monday thru Thursday
Hours: 7:30 am–5 pm
Map & Directions

Longmont
515 Coffman Street, Suite 114
Monday ONLY
Hours: 7:30 am–5 pm
Map & Directions

Lafayette
1376 Miners Drive, Unit 105
Tuesday ONLY
Hours: 7:30 am–5 pm
Map & Directions