Public and some special libraries currently registered with the Massachusetts Board of Library Commissioners (MBLC).

MassDOT Open Data2026-05-14 更新00

Locations of all correctional facilities (state, county and federal) that house inmates in the Commonwealth of Massachusetts.

MassGIS Open Data2026-05-14 更新00

Dams (Hosted Feature Layer)

Locations of dams derived from a dam safety database maintained by the Mass. Office of Dam Safety (ODS) that includes detailed information about each dam for operational purposes.

ArcGIS Hub2026-05-13 更新10

Libraries (Hosted Feature Layer)