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Pennsylvania in blue with Area Codes 610/484 in red

Area codes 610 and 484 are telephone area codes which serve the Eastern and Southeast regions of Pennsylvania. The area includes the cities of Allentown, Bethlehem, and Reading, along with much of the Delaware Valley (excluding Philadelphia), including most of the Pennsylvania Main Line. Created in anticipation of number exhaustion in the area code 215 serving the whole of southeast Pennsylvania, area code 610 was split off on the morning of January 8, 1994, with a year-long permissive dialing period ending on the morning of January 7, 1995.[1] Further growth in the region over the subsequent five years spurred the introduction of overlay plans in the Commonwealth, with area code 484 being overlaid upon 610 on June 5, 1999, along with the introduction of mandatory ten-digit dialing.[2]

Area code 835 was to be an additional overlay onto 610 and 484, announced by the Pennsylvania Public Utility Commission in May 2000 and to be implemented in 2001, but newly developed, more efficient number pooling measures were introduced in its stead, obviating the need for the new area code. The Commission formally withdrew plans for the new code on June 23, 2005, although the code remains reserved for later use within the Commonwealth if necessary.[3]

Area code 610 holds the distinction of being the last area code number to be assigned that had a "1" (one) for its middle digit. When area codes were introduced in 1947, all numbers followed the pattern N0N or N1N (where the middle digit was either a zero or one). By 1994, area code 610 was the last remaining number in this group. The next new area codes after 610 to be assigned (334 in Alabama and 360 in Washington, both in 1995) were the first to have numbers other than 0 or 1 for their middle digits.

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Commonwealth of Pennsylvania Area Codes: 215, 267, 412, 484, 570, 610, 717, 724, 814, 835, 878
North: 570
West: 717 610/484 East: 215/267, 856, 609, 908
South: 302, 410/443, 856
State of Delaware Area Code: 302
State of Maryland Area Codes: 240, 301, 410, 443
State of New Jersey Area Codes: 201, 551, 609, 732, 848, 856, 862, 908, 973

Coordinates: 40°05′10″N 75°21′25″W / 40.086°N 75.357°W / 40.086; -75.357

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