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  2. List of Illinois area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Illinois_area_codes

    The remainder of the state switched to ten-digit dialing in October 2021, as a result of the implementation of the 988 Suicide & Crisis Lifeline. Two years later, area code 861 went into effect on February 24, 2023, as an overlay with 309. [1] [2] Area code 730 went into effect on July 7, 2023, as an overlay complex with 618. As of that date ...

  3. Area codes 630 and 331 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_630_and_331

    On October 7, 2007, area code 331 began overlaying area code 630, making ten-digit dialing mandatory in the area. The Illinois side of the Chicago area– 312 / 773 / 872 , 708, 847/224, 630/331 and portions of 815/779 –is one of the largest local calling areas in the United States; with few exceptions, no long-distance charges are applied ...

  4. List of postal codes - Wikipedia

    en.wikipedia.org/wiki/List_of_postal_codes

    UAE does not use a postal code system; instead, they use a post office system to send and receive parcels. United Kingdom: Phased introduction, from 1966 to 1974. Still in use. GB: A[A]N[A/N] A[A]N[A/N] NAA Known as the postcode. The first letter(s) indicate the postal area, such as the town or part of London. Placed on a separate line below ...

  5. Internal Revenue Code - Wikipedia

    en.wikipedia.org/wiki/Internal_Revenue_Code

    The text of the Internal Revenue Code as published in title 26 of the U.S. Code is virtually identical to the Internal Revenue Code as published in the various volumes of the United States Statutes at Large. [3] Of the 50 enacted titles, the Internal Revenue Code is the only volume that has been published in the form of a separate code.

  6. ZIP Code - Wikipedia

    en.wikipedia.org/wiki/ZIP_Code

    The add-on code is often one of the following: the last four digits of the box number (e.g. PO Box 107050, Albany, NY 12201-7050), zero plus the last three digits of the box number (e.g., PO Box 17727, Eagle River, AK 99577-0727), or, if the box number consists of fewer than four digits, enough zeros are attached to the front of the box number ...

  7. Federal Information Processing Standard state code - Wikipedia

    en.wikipedia.org/wiki/Federal_Information...

    The FIPS state alpha code for each U.S. states and the District of Columbia are identical to the postal abbreviations by the United States Postal Service. From September 3, 1987, the same was true of the alpha code for each of the outlying areas, with the exception of U.S. Minor Outlying Islands (UM) as the USPS routes mail for these islands ...

  8. Area codes 847 and 224 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_847_and_224

    The numbering plan area (NPA) comprises the northeastern part of Illinois and many northern suburbs of Chicago. This includes most of Lake County, the northern part of Cook County, the northern part of Kane County, and a small part of McHenry County. Area code 847 was created on January 20, 1996, in a three-way split of area code 708.

  9. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    The all-number calling plan increased the number of permissible central office prefixes from 540 to potentially 800, but the first two digits of the central office code were still restricted to the range 2 to 9, and the eight combinations that ended in 11 were reserved as special calling codes. [32]