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The North American Numbering Plan (NANP) divides the regions of its member nations (primarily in North America, including the Caribbean) into geographic numbering plan areas (NPAs). Each area is assigned a three-digit area code which is prefixed to each telephone number issued in its service area. Some areas are assigned multiple codes in an overlay plan.

The rules for numbering NPAs do not permit the digits 0 and 1 as the leading digit, which also applies for central office codes. 0 has been used traditionally for operator-assisted telephone calls, and the digit 1 was traditionally ignored in switching equipment as a leading digit, because it could not be distinguished reliably from intermittent loop disconnections.[1] NPAs with 9 as the second digit are reserved for future format expansion. Area codes with the last two digits matching, such as 322 and 800, are considered easily recognizable codes (ERC), where the series of 8xx are used for toll-free services.

Source : Wiki

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  • RANKINGS

    # State Total %
      All 1,348,097 100%
    1 California 168,680 12.5%
    2 Texas 106,862 7.9%
    3 Florida 90,453 6.7%
    4 New York 89,933 6.7%
    5 Non-Geographic 62,724 4.7%
    6 Pennsylvania 52,251 3.9%
    7 Illinois 48,440 3.6%
    8 Ohio 46,215 3.4%
    9 Michigan 39,238 2.9%
    10 Georgia 38,337 2.8%
    11 North Carolina 34,886 2.6%
    12 New Jersey 30,421 2.3%
    13 Virginia 29,965 2.2%
    14 Washington 28,615 2.1%
    15 Massachusetts 28,200 2.1%
    16 Maryland 27,593 2%
    17 Tennessee 26,416 2%
    18 Arizona 25,252 1.9%
    19 Colorado 23,239 1.7%
    20 Indiana 23,084 1.7%
    21 Missouri 22,573 1.7%
    22 Minnesota 21,494 1.6%
    23 District Of Columbia 18,823 1.4%
    24 Wisconsin 18,066 1.3%
    25 Alabama 17,820 1.3%
    26 South Carolina 17,094 1.3%
    27 Louisiana 16,930 1.3%
    28 Oregon 16,337 1.2%
    29 Nevada 15,764 1.2%
    30 Kentucky 15,582 1.2%
    31 Connecticut 14,072 1%
    32 Oklahoma 12,697 0.9%
    33 Kansas 11,172 0.8%
    34 Utah 11,160 0.8%
    35 Iowa 10,146 0.8%
    36 Mississippi 9,891 0.7%
    37 Arkansas 9,877 0.7%
    38 New Mexico 8,192 0.6%
    39 Nebraska 7,130 0.5%
    40 Idaho 5,727 0.4%
    41 West Virginia 5,436 0.4%
    42 Delaware 5,044 0.4%
    43 Rhode Island 4,255 0.3%
    44 Hawaii 3,992 0.3%
    45 Puerto Rico 3,868 0.3%
    46 Maine 3,867 0.3%
    47 New Hampshire 3,647 0.3%
    48 North Dakota 3,331 0.2%
    49 Montana 3,302 0.2%
    50 South Dakota 2,849 0.2%
    51 Wyoming 2,617 0.2%
    52 Vermont 2,106 0.2%
    53 Alaska 1,672 0.1%
    54 Virgin Islands 521 0%
    55 Guam 198 0%
    56 American Samoa 21 0%
    57 Northern Mariana Islands 20 0%