Phone numbers in Poolesville, Maryland
Poolesville has 8 phone prefixes in area codes 240, 301.
Biggest holders: Peerless Network Of Maryland, MCImetro (Verizon Business), Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 12%
- Local phone company 12%
- Internet / business phone carrier 75%
Every prefix in Poolesville
Search the first six digits of a number in this list. If it's here, the number started in Poolesville with the carrier shown. If it isn't, check the Maryland page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 240-220 | Peerless Network Of Maryland | Internet / business phone carrier | – |
| 240-255 | Peerless Network Of Maryland | Internet / business phone carrier | – |
| 240-489 | MCImetro (Verizon Business) | Internet / business phone carrier | 2001 |
| 240-771 | Onvoy | Internet / business phone carrier | 2016 |
| 240-812 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 240-961 | Verizon Wireless | Mobile carrier | 2022 |
| 301-349 | Verizon (local phone) | Local phone company | – |
| 301-691 | Teleport Communications America | Internet / business phone carrier | – |
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.