This polygon dataset represents the 2010 TIGER/Line census counties for Maryland. The TIGER/Line Files are shapefiles and related database files (.dbf) that are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB). The primary legal divisions of most States are termed counties.
United States. Bureau of the Census. Geography Division