ZIP Codes are administrative entities of the U.S. Postal Service. As such:
They do not coincide with the Census Bureau's geographic or political areas.
They change according to postal requirements.
They do not have specific boundaries.
Their implied boundaries do not necessarily follow clearly identifiable physical features.
ZIP Codes are summarized in the economic census for individual 5-digit ZIP Codes in the Retail Trade sector and several of the Services sectors. These statistics are limited to a count of the establishments in each industry by sales/receipts/revenue-size range of establishments.
Note: These ZIP Codes are reported by businesses or coded from addresses. They are not the ZIP Code Tabulation Areas (ZCTAs) published in the Decennial Census.