Phone numbers in Mammoth, Pennsylvania
Mammoth has 3 phone prefixes in area code 724.
Biggest holders: Citizens Tel. Co. Of Kecksburg, Armstrong Telecommunications. This is the local calling area (rate center) where those prefixes were first assigned.
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Every prefix in Mammoth
Search the first six digits of a number in this list. If it's here, the number started in Mammoth with the carrier shown. If it isn't, check the Pennsylvania page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 724-423 | Citizens Tel. Co. Of Kecksburg | Phone company | – |
| 724-424 | Citizens Tel. Co. Of Kecksburg | Phone company | – |
| 724-849 | Armstrong Telecommunications | Phone company | 2005 |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.