Mount Oliver, Pennsylvania Area Code

Mount Oliver, PA Area Codes are

412 and 878

Mount Oliver, PA is officially utilizing an area code overlay in which area codes 412 and 878 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary.

In addition to Mount Oliver, PA area code information read more about area codes 412 and 878 details and Pennsylvania area codes.

Mount Oliver, PA is located in Allegheny County and observes the Eastern Time Zone. View our Times by Area Code tool.

Pennsylvania Area Code Map