Area codes 610, 484, and 835 are telephone area codes in the state of Pennsylvania, USA. Area code 610 was created on January 8, 1994, as a split from area code 215. It was the last original area code which had either a 0 or 1 as the middle digit. Future area codes would have digits from 2 to 8 in the middle. It covers cities such as Allentown, Bethlehem, Reading, Chester, and Norristown. It was overlaid by 484 in 1999 and 835 in 2022.