ZIP CODE TABULATION AREAS 2000 --
ZIP Code Tabulation Areas, 2000 (1:100,000)
ZIP Code Tabulation Areas (ZCTAs) 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’s ZIP Code delivery areas, and are not stable over time.
FGDC metadata: ZCTA_USCB_2000_IN