Description: ZIP Code Tabulation Areas, 2005 (1:100,000) - Shows ZIP Code Tabulation Areas (ZCTAs), which are a statistical entity developed by the U.S. Census Bureau for tabulating summary statistics from Census 2000. ZCTAs are generalized representations of U.S. Postal Service (USPS) ZIP Code service areas. ZCTAs follow census block boundaries, are not exact representations of the USPS ZIP Code delivery areas, and are not stable over time. This data set has been updated using the U.S. Census Bureau Census 2005 TIGER/Line Files (First Edition), which contain updated ZCTAs reflecting U.S. Postal Service ZIP Code changes through October, 2002. There will be no further updates of ZCTAs until required for the 2010 Census.