Enterprise GIS Division. Carroll County Government's GIS Open Data site for exploring thematic topics covered and downloading GIS datasets. Datasets available include addr...
Technology Services, GIS Services. This is the Montgomery County Government GIS Open Data Website used for exploring and downloading public GIS Open Datasets. Available datasets incl...
Enterprise GIS Division. The Carroll County, Maryland website Enterprise GIS Division page has tiled aerial photography (2000 & 2006) and elevation contours (2015, 2-foot) ...
Information Technology, GIS Division. This is the Prince George's County Open Data portal and includes geospatial datasets. Datasets available include boundaries, roads, election and po...
1590-1975. The Maryland Map collection is a comprehensive collection of more than 2,500 maps depicting Maryland, the Chesapeake Bay, and the surrounding regio...
Information Technology, GIS Group. County maps and GIS data for Anne Arundel County. Several County Departments have collaborated to provide maps and GIS data for citizens and busine...
Information Technology, Business Applications, GIS Team. ArcGIS Open Data Portal for Baltimore County, Maryland.
Technology Services Enterprise GIS. ArcGIS Open Data Portal for Calvert County, Maryland.
ArcGIS Open Data Portal for the city of Baltimore, Maryland.
Montgomery County Planning Department. Downloadable data files for Montgomery County, Maryland.
DVRPC GIS. ArcGIS Open Data Portal for the Delaware Valley Regional Planning Commission serving the greater Philadelphia region.
Frederick County GIS. Open data for Frederick County, Maryland.
Geographical Information Systems- Mapping. Downloadable data for Property Information, Boundaries, Environmental, Planimetric, and Topography.
Planning and Zoning Department. ArcGIS Open Data Portal for Harford County, Maryland.
Technology and Communication Services, GIS Division. Downloadable data files for Howard County, Maryland.
18. Maryland iMap
GIS data catalog for the state of Maryland.
19. Open Baltimore
Information Technology Enterprise GIS. Socrata data portal for the city of Baltimore, Maryland.
20. Open Data DC
Office of the Chief Technology Officer (OCTO), District of Columbia GIS (DC GIS). ArcGIS Open Data Portal for Washington, D.C.