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* Note: NSA boundaries may overlap over several CSAs. When more than 50% of a NSA falls within a particular community it is assigned to that community. No NSAs in these files are assigned to more than one community.
Maryland iMap Open Data Portal
Baltimore Metropolitan Council Regional GIS Data Center
GIS Resources at the Maryland State Data Center
State Highway Administration GIS Data Download Center
University of Maryland GIS Data Repository
Baltimore County, Maryland GIS Data Downloads
Howard County, Maryland Data Downloads
Carroll County, Maryland Open GIS Data Portal
Anne Arundel County, Maryland Data Downloads
Maryland State Geographic Information Committee (MSGIC)
Maryland Department of Natural Resources Maps and Map Data
District of Columbia Open Data