Base Period Sales from July 1, 2022-June 30, 2024 with Time Trends
In areas with few sales, the Assessor is allowed to use comparable sales going back up to five years.
Current 2025/2026 Tax Years: Residential Sales
Apartment Buildings and Manufactured Housing
Manufactured homes are also referred to as Mobile Homes. Please see Understanding Titled Manufactured Homes (Mobile Homes) for more information.
Manufactured Housing Comparable Sales XLSX
2025 Apartment Time Trends-Market Areas: 640, 641, 642, 643, 644, 645; Mobile Home Parks: 646 XLSX
Residential Comparable Sales Lookup Tool
Use the Residential Comparable Sales Lookup Tool (Residential Only)
- View the Lookup Tool instructional video (20 minute extended version)
- View the Lookup Tool instructional video (7 minute version)
- View the Lookup Tool training document with step-by-step instructions
- For questions during office hours, you can reach the main office at 303-441-3530. Or email us any time at assessor@bouldercounty.gov.
Market Area Maps for Single Family Properties
Comparable properties are often found in the same Market Area, which are groups of neighborhoods that have similar trends in the market. Boulder County uses these areas to establish market value for mass appraisal purposes.
- Countywide Map
- Boulder & Gunbarrel Map
- Longmont & Niwot Map
- Erie, Lafayette, Louisville, & Superior Map
Residential Comparable Properties Lists
Single Family, Duplex, and Triplex Residences
Residential Townhomes
Residential Condominiums
Contact Us
Assessor
Phone: 303-441-3530
Fax: 303-441-4996
Mailing Address
PO Box 471
Boulder, CO 80306-0471
Hours: 7:30 a.m. to 5 p.m.
Monday-Thursday
Closed Friday
Locations
Assessor Boulder and Longmont Drop Boxes
Boulder
1325 Pearl St., 2nd floor
Boulder, CO 80302
Hours: 7:30 a.m. to 5 p.m.
Monday-Thursday
Map and Directions Boulder Location
Longmont
515 Coffman St., Suite 114
Hours: 7:30 a.m. to 5 p.m.
Monday only
Map and Directions Longmont Location
Lafayette
1755 S Public Road
Hours: 7:30 a.m. to 5 p.m.
Tuesday only
Map and Directions Lafayette Location
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Contact Us
Assessor
Phone: 303-441-3530
Fax: 303-441-4996
Mailing Address
PO Box 471
Boulder, CO 80306-0471
Hours: 7:30 a.m. to 5 p.m.
Monday-Thursday
Closed Friday
Locations
Assessor Boulder and Longmont Drop Boxes
Boulder
1325 Pearl St., 2nd floor
Boulder, CO 80302
Hours: 7:30 a.m. to 5 p.m.
Monday-Thursday
Map and Directions Boulder Location
Longmont
515 Coffman St., Suite 114
Hours: 7:30 a.m. to 5 p.m.
Monday only
Map and Directions Longmont Location
Lafayette
1755 S Public Road
Hours: 7:30 a.m. to 5 p.m.
Tuesday only
Map and Directions Lafayette Location