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What is a ZIP+4 Code?

April 26, 2017code Zip+4

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What is a ZIP+4 Code?

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A ZIP+4 Code consists of the original 5-digit ZIP Code plus a 4-digit add-on code. The 4-digit add-on code identifies a geographic segment within the 5-digit delivery area, such as a city block, office building, etc.

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This refers to the 5-digit ZIP code plus a 4-digit add-on number which identifies a geographic segment within the 5-digit delivery area, such as a city block, office building, individual high-volume receiver of mail, or any other distinct mail unit. The purpose of +4 codes is to aid efficient mail sorting and delivery. Business mailers are the primary users of ZIP+4s, because mailers who mail in bulk on the ZIP+4 or carrier route level can receive rate discounts.