| | Name | PostalCodeExtension | | Business Definition | The purpose of +4 codes is to aid efficient mail sorting and delivery. Business mailers are the primary users of ZIP+4’s, because mailers who mail in bulk on the ZIP+4 or carrier route level can receive rate discounts. (ref: http://www.carrierroutes.com/ZIPCodes.html) | | Business Context | Treasury / Fiscal Service | | Registry Status Code | | Standard | Administrative Status Code | Approved/Standard |
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| | | Version Identifier | 4.8 | | Data Security Code | Public | | Effective Date | 2012-03-15 | | Published Date | 2012-06-28 |
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