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US ZIP codes are a type of postal code used within the United States to help the United States Postal Service (USPS) route mail more efficiently. ZIP codes near me are shown on the map above. Some still refer to ZIP codes as US postal codes. The term ZIP stands for Zone Improvement Plan. The basic 5-digit format was first introduced in 1963 and ...
Browse a complete list of area codes and look up area codes by city, state, or map. Reverse lookup areas codes by phone number and auto-detect your own area code by location.
Understanding Area codes. The United States of America is divided into regions, known as area codes that correspond with telephone dialing areas. Based on population, some states have only one area code, whereas others may have multiple area codes. The need for more telephone numbers increased and led to the need for additional area codes.
An area code overlay occurs when more than one area code serves the same geographic area. In an area code overlay, relief is provided by opening up a new area code within the same geographic area as the area code requiring relief. With an overlay, all current customers keep their area code and telephone number. Numbers from this new area code ...
In telecommunications, an area code overlay complex is a telephone numbering plan that assigns multiple area codes to the same geographic numbering plan area (NPA). Area code overlays are implemented in territories of the North American Numbering Plan (NANP) to mitigate exhaustion of central office codes in growth areas. The method has been in use since 1992, and has been the exclusive method ...
Illinois 217 224 309 312 331 447 464 618 630 708 730 773 779 815 847 861 872. Indiana 219 260 317 463 574 765 812 930. Iowa 319 515 563 641 712. Kansas 316 620 785 913. Kentucky 270 364 502 606 859. Louisiana 225 318 337 504 985. Maine 207. Maryland 227 240 301 410 443 667. Massachusetts 339 351 413 508 617 774 781 857 978.
