Phone numbers in Frostburg, Maryland
Frostburg has 6 phone prefixes in area codes 240, 301.
Biggest holders: Verizon (local phone), Level 3 (Lumen), MCImetro (Verizon Business). This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 33%
- Internet / business phone carrier 67%
Every prefix in Frostburg
Search the first six digits of a number in this list. If it's here, the number started in Frostburg with the carrier shown. If it isn't, check the Maryland page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 240-284 | Level 3 (Lumen) | Internet / business phone carrier | 2004 |
| 240-657 | MCImetro (Verizon Business) | Internet / business phone carrier | 2016 |
| 240-824 | Onvoy | Internet / business phone carrier | 2021 |
| 240-943 | Comcast | Internet / business phone carrier | 2022 |
| 301-687 | Verizon (local phone) | Local phone company | – |
| 301-689 | Verizon (local phone) | Local phone company | – |
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.