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prior to 1991, was the area code for Mexico City; split of 416; 2001: overlaid by 289; 2013: overlaid by 365; 2021: overlaid by 742 [8] 537 reserved as a fifth area code for the region. 906: Michigan (Upper Peninsula: Sault Ste. Marie, Escanaba, Houghton, Iron Mountain, Marquette, Menominee, etc.) March 19, 1961: split of 616; 907
By this time, overlays had gained more acceptance, so area code 878 was implemented as an overlay for both 412 and 724 on August 17, 2001. [2] Although telephone numbers were not assigned for 878 until 2013 (and were only assigned in the 724 area until 2015), ten-digit dialing has been mandatory across southwestern Pennsylvania since 2001.
This is a list of telephone area codes of Pennsylvania. In 1947, the American Telephone and Telegraph Company divided Pennsylvania into four numbering plan areas (NPAs) and assigned distinct area codes for each. Since 1995, several relief actions in form of area code splits and overlays have expanded the list of area
Area code 412 had served southwestern Pennsylvania for 41 years since 1947, before area code 724 was created for most of the old 412 territory outside of Pittsburgh in 1998. Bell Atlantic (now part of Verizon ), the main telephone provider in the area, wanted to implement 724 as an overlay to spare residents and businesses the burden of ...
The coastal area to the west was assigned area code 415. [2] Area code 408 was split from numbering plan area 415 in a flash-cut (without permissive dialing period) on March 1, 1959. The new numbering plan area included most of Santa Clara, Santa Cruz, Monterey and San Benito Counties.
On March 1, 1959, area code 707 was created from the northern part, and area code 408 was created for San Jose, the South Bay, the Monterey Bay, and the Salinas Valley. [5] (408 has since been split to 831 and overlaid with 669. 707 has since been overlaid with 369.) On September 2, 1991, area code 510 was created for the East Bay, including ...
The U.S. state of Washington has six telephone area codes. The state initially used a single area code until it was divided in 1957 with the creation of area code 509 to serve Eastern Washington. In 1995, 206 was split again to serve just the Puget Sound region after area code 360 was created for the remainder of Western Washington.
The state of California was divided into three numbering plan areas (NPAs) with distinct area codes: 213, 415, and 916, for the southern, central, and northern parts of the state, respectively. [ 1 ] In 1950, the boundaries of the numbering plan area were redrawn to produce a division of the northern and central parts along a north–south ...