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  2. List of ZIP Code prefixes - Wikipedia

    en.wikipedia.org/wiki/List_of_ZIP_Code_prefixes

    An asterisk (*) indicates that the listed place name is the "default" place name for all addresses in the prefix, that is, that addresses for all ZIP codes beginning with that three-digit prefix will have that place name in the city portion of the address (example: 23219, 23224, and 23294 will all have "Richmond, Virginia" addresses, even if ...

  3. N11 code - Wikipedia

    en.wikipedia.org/wiki/N11_code

    An N11 code (pronounced Enn-one-one) is a three-digit dialing code used in abbreviated dialing in the North American Numbering Plan (NANP). The mnemonic N stands for the digits 2 through 9 and thus the syntax stands for the codes 211, 311, 411, 511, 611, 711, 811, and 911. These dialing codes provide access to special local services, such as ...

  4. Original North American area codes - Wikipedia

    en.wikipedia.org/wiki/Original_North_American...

    Therefore, numbering plan area codes, often termed just area codes, were defined to have three digits, with the middle digit being 0 or 1. Area codes with the middle digit 0 were assigned to numbering plan areas that comprised an entire state or province, while jurisdictions with multiple numbering plan areas received area codes having 1 as the ...

  5. Telephone numbering plan - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbering_plan

    Area codes in the NANP have three digits, while two digits are used in Brazil, one digit in Australia and New Zealand. Variable-length formats exist in multiple countries including: Argentina , Austria (1 to 4), Germany (2 to 5 digits), Japan (1 to 5), Mexico (2 or 3 digits), Peru (1 or 2), Syria (1 or 2) and the United Kingdom .

  6. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    Using 0 or 1 as the first digit of an area code or central office code is invalid, as is a 9 as the middle digit of an area code; these are trunk prefixes or reserved for North American Numbering Plan expansion. For example, 234 235-5678 is a valid telephone number; with area code 234, central office prefix (exchange) 235, and line number 5678.

  7. List of U.S. state and territory abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._state_and...

    ANSI. 2-letter and 2-digit codes from the ANSI standard INCITS 38:2009 (supersedes FIPS 5-2) USPS. 2-letter codes used by the United States Postal Service. USCG. 2-letter codes used by the United States Coast Guard (bold red text shows differences between ANSI and USCG) Abbreviations: GPO. Older variable-length official US Government Printing ...

  8. Interchangeable NPA and central office codes - Wikipedia

    en.wikipedia.org/wiki/Interchangeable_NPA_and...

    Interchangeable numbering plan area (NPA) codes and central office codes are codes that permit any of the ten numerals in the middle position of the area code and the central office code, which both are three-digit numbers. [1] [2] This change in numbering format was implemented first for central office codes by 1973, which eliminated the ...

  9. ZIP Code - Wikipedia

    en.wikipedia.org/wiki/ZIP_Code

    A ZIP Code (an acronym for Zone Improvement Plan[1]) is a system of postal codes used by the United States Postal Service (USPS). The term ZIP was chosen to suggest that the mail travels more efficiently and quickly [2] (zipping along) when senders use the code in the postal address. Introduced on July 1, 1963, the basic format comprised five ...