Sources and freshness
Every layer was retrieved on October 30, 2026.
| Layer | Publisher | Records |
|---|---|---|
| Property tax parcels with assessor data (Level 3) | MassGIS, from the assessor of each city and town | 2,182,111 parcels |
| Tier-classified 21E sites, currently active | MassDEP, via MassGIS | 2,287 |
| Sites with an Activity and Use Limitation | MassDEP, via MassGIS | 4,091 |
| City and town boundaries | MassGIS, Census 2020 towns | 351 |
Assessments by fiscal year on the file: FY2026: 1,505,063, FY2025: 400,407, FY2027: 380,271, FY2023: 180,441. Most recent sale on the file: October 17, 2026. Each town updates its file on its own schedule; a sale or a new assessment after the date of the town's file will not show yet. The report, prepared on the day you order it, queries the Commonwealth's services again.