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General issues:ZIP codes are defined at the convenience of the U.S. Postal Service and may changefrom time to time.
ZIP codes in the Economic Census and ZBP are those reported by the businesses or on administrative address lists. ZIP Code tabulation areas (ZCTAs) in Census 2000 are statistical geographic entities that approximates the delivery area for a U.S. Postal Service five-digit and three-digit ZIP Codes. ZCTAs are aggregations of census blocks that had the same predominant ZIP Code associated wth the residential mailing addresses in the Census Bureau's master address file for Census 2000.
Maps: To obtain a map of a single ZIP Code tabulation area, follow steps 1 through 4.3. below, then select a single 5-digit code and click the "Map It" button. Census 2000 ZCTA maps are also accessible from the 1997 Economic Census ZIP Code Statistics.