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Frederick County GIS distributes countywide base maps and orthophotography.  Frederick County GIS also offers a free GIS data download service. GIS Base Data, Orthophotography, Contour-Planimetric Data as well as Parcel Data, are all available in this download service. Help for using our download system and recommended free desktop software to view our GIS data is available by clicking on the (PDF).  In addition to digital products, CD or DVD format products are available for purchase.


While efforts have been made to ensure the accuracy of this data, Frederick County accepts no liability or responsibility for errors, omissions, or positional inaccuracies in the content of this data. Reliance on this data is at the risk of the user. The data is for illustration purposes only and should not be used for surveying, engineering, or site-specific analysis.

GIS Base Data

The GIS Base Data includes core map layers such as county boundary, municipal boundaries, place names, road centerlines and zoning in shapefile format. Shapefile is a vector file format used in ArcGIS by ESRI.