Area code 312 is the telephone area code for downtown Chicago, which includes the Chicago Loop and its immediate environs. The plan area is completely.
The codes below in format +1 XXX represent area code XXX within the +1 NANP zone – not a.
Wiki area codes - tri fastMain page Contents Featured content Current events Random article Donate to Wikipedia Wikipedia store. Area codes were only required in ten-digit dialing when placing foreign area calls to subscribers in another state or numbering plan area. Mary's County, all counties and cities which touch the Chesapeake Bay , the Atlantic Ocean , or Delaware , including Annapolis , metropolitan Baltimore , Berlin, Cambridge, Ocean City , Princess Anne, and Salisbury as well as Howard County Columbia and Carroll County Westminster. These systems expanded by growing their subscriber bases, as well as increasing their service areas by implementing additional local exchanges that were interconnected with tie trunks. Local information number for transportation and road conditions, local police non-emergency services. The hotel claims that it is the oldest continuously used number in New York City.
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- Listed for Canada, but no date has been scheduled for this to go into effect. Callers from outside the local-calling region of the assigned number, however, pay for a long-distance call, although domestic long-distance rates are generally lower than the rates in caller-pays systems.
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- In Canada, some provinces share area codes. By area, it is one of the smallest plan areas in North America. For example, station numbers may be assigned as the room number of a hotel or hospital.
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Help About Wikipedia Community portal Recent changes Contact page. In summary: most of the desert and mountain portions of southeastern California. It originally served the entire five boroughs of New York City. Retrieved from " americasurf.info? There are also special codes , such as: Note : The four-digit numbers are not implemented in some areas. This is a list of North American telephone area codes in effect for the North American Numbering Plan NANP.