High-Resolution County Boundary Map of Maryland

      This is a vector format map. Unlike raster images, it can be rescaled without distortion.  The map were created in ArcGIS 8.3 and consists of polyline segments.  Two file formats are available:  Autodesk's Drawing Exchange Format (.DXF), and ESRI's Shapefile (.SHP). These are widely accepted vector data standards and are used by programs such as AutoCAD, ArcGIS, ArcInfo, CorelDraw, Adobe Illustrator, JASC's Paint Shop Pro, Bryce 3D, 3D Studio Max, and many Intergraph programs.
     A metadata file accompanies each file.  The metadata describe map projections, compilation procedures and all other critical parameters necessary to the proper use of the data.  A summary of the metadata is presented at the end of the table below.
      To download data click on the desired file format in the table below. Files have been compressed with Winzip to decrease download times.  You will not be able to view the files on-line.
     If you need high-resolution shoreline maps of tidewater Maryland counties see the Shoreline Vector Map page.

Maryland County Boundaries		Click to download these formats (file size, kilobytes)
		dxf (587)	shp (784)

Description:  These data are produced by the State Highway Administration's Highway Mapping Team for their GRID Map base. They originally were digitized from the USGS 7.5' quadrangle maps and have been enhanced through property records research. This database does not contain the new boundary near Takoma Park between Prince George's and Montgomery counties. The data are created to be map accurate at a scale of 1:24,000. These data were created on a CAD (Computer Aided Design) type of system. They were merged into county files and converted to a GIS format by Towson State University under contract to the Maryland Office of Planning

• Layer Name: SHA Political County Boundaries
• Name Description: County boundaries as mapped by the Maryland State Highway Administration
• Date: 1995
• Scale: 1:24,000 (1" = 2,000 feet)
• Scale Tolerance: 40 feet on the ground.
• Custodian: State Highway Administration, Department of Natural Resources / Chesapeake & Coastal Watershed Service
• Contact: rsdavis@sha.state.md.us or kenmiller@dnr.state.md.us
• Data Type: Vector
• Datum: Maryland State Plane Coordinate System, NAD 83, meters
• Metadata Date: November 11, 1999