Some Pennsylvania residents are seeing a new area code come into effect. The Pennsylvania Public Utility Commission says residents and businesses in eastern and southeastern Pennsylvania should be aware of the activation of the new 835 area code. It will serve the same geographic region as the existing 610 and 484 areas – so no changes in dialing will be necessary. Officials say the new code is needed because the remaining supply of numbers in the current 610/484 area is nearly exhausted.