Current 2025/2026 Tax Years: Residential Sales

• Comparable Sales Landing Page
• Nonresidential Comparable Sales Lists with Time Trending
• Using Time Trending

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.

Residential Comparable Properties Lists

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.

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 and Gunbarrel Map
• Longmont and Niwot Map
• Erie, Lafayette, Louisville, and Superior Map