Map of Maryland County Boundaries


Maryland County Boundaries Shapefile (download)

Source: Chesapeake Bay ​Program


  • This polygon shapefile represents the geographic boundaries of the 23 Maryland counties and Baltimore City. The counties in this polygon file relate to TMDLs and WLAs in the applicable query via county name.

Please direct any questions or comments concerning this data to Jeff White at jeff.white@maryland.govor 410-537-3884.​​​​​​​​