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Devon-Berwyn Census-designated place Country United States State Pennsylvania County Chester Townships Easttown , Tredyffrin Area 2.5  miﾲ (6.5  kmﾲ )  - land 2.5  miﾲ (6.5  kmﾲ )  - water 0.0  miﾲ (0  kmﾲ ) Center  - coordinates 40ﾰ022373N, 75ﾰ262103W  - elevation 492  ft (150  m ) Population 5,067 ( 2000 ) Density 2,028.1 / miﾲ (783.1 / kmﾲ ) Time zone EST ( UTC-5 )  -  summer (DST) EDT ( UTC-4 ) Area code 610 Location of Devon-Berwyn in Pennsylvania Location of Pennsylvania in the United States Devon-Berwyn is a census-designated place that probably describes the densely populated area at the center of what the residents and the post office consider the two separate towns of Devon and Berwyn, in Chester County , Pennsylvania , United States . As of the 2000 census, the population was 5,067. Devon and Berwyn are both part of Pennsylvania's Main Line . There is no governmental unit associated with either, and both are split between the governmental units of Tredyffrin Township (in the north) and Easttown Township (in the south). The main headquarters for SunCom Wireless is located in Berwyn.