MD iMAP: Maryland Census Data - ZIP Code Tabulation Areas (ZCTAs)
This is a MD iMAP hosted service. Find more information at  http://imap.maryland.gov. The units of geography used for the 2010 Census maps displayed here are the Zip Code Tabulation Area (ZCTA). ZCTAs are statistical geographic areas produced by the Census Bureau by aggregating census blocks to create generalized …