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Last updated: 30-Apr-2018
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2Checkout offers support for both standard and ZIP+4 ZIP codes.

Standard US zip codes

The standard zip code notation used by the United States Postal service uses five digits to identify a delivery area.

An example of a standard US zip code is 90210.

ZIP+4 codes

In addition to the classic five-digit zip codes used in the United States, 2Checkout also supports the use of ZIP+4 add-on zip codes, important when shipping physical goods.

The ZIP+4 system uses the basic five-digit code together with four additional digits to identify a geographic segment located within a five-digit delivery area. The segment can be a city block, a group of apartments or other mail receiving units that could benefit from the use of an additional identifier.

An example of a ZIP+4 zip code is 99577-0727.

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