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The three area codes are overlay codes for one numbering plan area, among which 410 was the initial area code for the NPA, when it was split from area code 301 in 1991. 443 and 667 found assignment primarily in cellular service and for competitive local exchange carriers, such as Comcast and Cavalier Telephone, when introduced, but have since ...
The blue area is assigned area codes 301, 240, and 227; the red area is area codes 410, 443 and 667 The state of Maryland is served by the following area codes: Area codes
area code 387 is reserved as a fifth code for the region; 438: Quebec (Montreal metropolitan area) November 4, 2006: overlaid on 514; 2022: overlaid by 263; 439: not in use; available for geographic assignment 440: Ohio (surrounding Cleveland on three sides, including: Elyria, Lorain, Oberlin, Ashtabula, and most of north-central Ohio) August ...
Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+08:00), Cuba Standard Time (UTC−05:00), and (North American) Central Standard Time (UTC−06:00), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in ...
Area code 301 was the first area code for all of Maryland, from 1947, when the area code system was created, until 1991, when everything from Baltimore eastward split off as area code 410. In 1997, area code 240 was added as an overlay area code for the 301 territory. On June 14, 2023, a third overlay code, 227, was added to provide more ...
Having been staved off nearly seven years, the overlay with 424 was finally implemented on July 26, 2006. On December 31, 2005, customers began dialing 1 + area code + seven-digit number whenever a call is placed by a caller in the 310 or 424 area code to any other area code, including 310 to 424 or 424 to 310. After July 26, 2006, customers ...
Area codes in the United States This page was last edited on 3 February 2012, at 03:26 (UTC) . Text is available under the Creative Commons Attribution-ShareAlike 4.0 License ; additional terms may apply.
Area codes 510 and 341 are telephone area codes in the North American Numbering Plan (NANP) serving much of the East Bay in the U.S. state of California. They cover parts of Contra Costa County and western Alameda County, including the city of Oakland, but excluding Dublin, Livermore, Pleasanton, and Sunol. Area code 510 was established on ...