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As a result, some addresses end up with a ZCTA code that is different from their ZIP code. ZCTAs are not developed for ZIP codes that comprise only a small number of addresses. [3] Several ZCTAs represent ZIPs that no longer exist due to realignment by the USPS. There are approximately 42,000 ZIP Codes and 32,000 ZCTAs.
Address-checking tools using AMS provide address standardization, as well as city/state and ZIP Code lookup features. [1] Business mailers use the USPS Address Management System:-[e correct ZIP Codes. City/state lookup services use AMS to provide the city and state corresponding to any given ZIP Code. [2]
ZCTAs or ZIP Code Tabulation Areas are the census equivalent of ZIP codes used for statistical purposes. The reason why regular ZIP codes are not used is because they are defined by routes rather than geographic boundaries. Thus, they have the tendency to overlap and otherwise create difficulties.
A check of address using LACS is typically not performed by the USPS, but by third parties who license the LACS data from the USPS. A licensee will create or purchase software to perform the LACS check and receive monthly or bi-monthly updates of LACS data from the USPS.
There are generally two widely accepted versions of a postal code: a ZIP code and a ZIP + 4 code. Established in 1963, ZIP codes are the most common and recognizable postal code used by the USPS.
If the address is valid, it is assigned a ZIP+4 code something like this: 12344-5678, where the first five digits are the ZIP code and the trailing four digits are the delivery range. An address with a ZIP+4 code (or nine-digit ZIP code) is considered to be valid. In most cases, this means that the address is deliverable.
The barcode data contains such information as amount of postage, origin zip code, destination, mail class, weight, confirmation/tracking numbers, and a cryptographic signature. The human-readable information shows at a minimum the information required by the USPS Domestic Mail Manual (DMM). [1]
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