In addition to the maps and atlases in the Map Library section, be sure to check out these geospatial data portals and web map viewers.

Boston

• Analyze Boston - City of Boston's Open Data Hub, where you will find GIS Data published by the Planning other city departments.
• BostonMaps - City of Boston's ArcGIS Online web mapping platform.
• Assessing Online - Information on the City of Boston's assessed values, ownership and tax information, much more. 

Massachusetts

• Mass GIS Data Layers - download free statewide data layers.
• MassGIS ArcGIS Online - MassGIS interactive maps and streaming web services.
• MassMapper - the MassGIS interactive mapping tool.
• FEMA's National Flood Hazard Layer Viewer - view, download, and print current effective flood hazard data.

For more information about Maps and GIS Data, please contact us by email at [email protected].