Zip Area Code

Mammoth, Pennsylvania

Mammoth, Pennsylvania, in Westmoreland County, has ZIP code 15664 and area code 724, with 878 as an overlay.

ZIP code
15664
Area codes
724, 878
Time zone
Eastern Time
Coordinates
40.3108, -79.6172

ZIP codes in Mammoth

ZIP codePost officeCountyArea codes
15664*MammothWestmoreland County724, 878

* No mapped delivery area: P.O. boxes or a single organization. Area codes are those of the nearest ZIP code area.

Area codes for Mammoth

  • Area code 724

    In service since February 1, 1998. Shares its area with 878. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

  • Area code 878

    In service since August 17, 2001. Shares its area with 412 and 724. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

Area codes here are matched from telephone rate centers, so a place near a boundary can have local numbers from either side of it.

Time zone

Mammoth is in the Eastern Time zone.

Towns near Mammoth