ZIP Code A ZIP (Zone Improvement Plan) Code is a five-, seven-, nine-, or eleven-digit code assigned by the U.S. Postal Service to a section of a street, a collection of streets, an establishment, structure, or group of post office boxes, for the delivery of mail. The Census Bureau uses only 5-digit ZIP codes for the addresses and address ranges in most Census 2000 operations. ZIP Code Tabulation Area (ZCTA) A ZIP Code Tabulation Area is a geographic area that approximates the delivery area for a five-digit or a three-digit ZIP Code. ZCTAs do not precisely depict the area within which mail deliveries associated with that ZIP Code occur. A five-digit ZCTA ending in "HH" (e.g., "006HH") represents the water area within a three-digit ZCTA that is not associated with any mail delivery route. A five-digit ZCTA ending in "XX" (e.g., "006XX") represents the land area within a three-digit ZCTA that is not associated with any mail delivery route. Zona Urbana Represents a census designated place that is the governmental center of each municipio in Puerto Rico. There are no incorporated places in Puerto Rico. Related term: Municipio
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