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  2. List of Illinois area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Illinois_area_codes

    Shortly after in 1996, area code 773 was created for the residential parts of the city of Chicago, while downtown kept area code 312. Area code 847 exhausted its numbers quickly, so that an overlay area code, 224, was implemented in 1996 for relief. However, mandatory ten-digit dialing was not in effect until 2002. In March 2007, an overlay ...

  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. Darien, Illinois - Wikipedia

    en.wikipedia.org/wiki/Darien,_Illinois

    ZIP code(s) 60561. Area code(s) 630 and 331: ... Today the cemetery is still located at 67th and Clarendon Hills Road. In 1899, a new church was built on the ...

  6. 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.

  7. 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 ...

  8. Area codes 309 and 861 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_309_and_861

    The area code had telephone numbers assigned for the central office code 988. In 2020, 988 was designated nationwide as a dialing code for the National Suicide Prevention Lifeline, which created a conflict for exchanges that still permitted seven-digit dialing. [2] NANPA exhaust projections for 309 in 2021 determined an exhaustion date in late ...

  9. 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.