Phone numbers in Waldorf, Maryland
Waldorf has 57 phone prefixes in area codes 227, 240, 301.
Biggest holders: AT&T Mobility, Verizon Wireless, Verizon (local phone). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 47%
- Local phone company 18%
- Internet / business phone carrier 32%
- Paging service 2%
- Phone company 2%
Every prefix in Waldorf
Search the first six digits of a number in this list. If it's here, the number started in Waldorf with the carrier shown. If it isn't, check the Maryland page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 227-220 | AT&T Mobility | Mobile carrier | 2023 |
| 227-263 | Bandwidth | Internet / business phone carrier | 2024 |
| 227-278 | T-Mobile (including Sprint) | Mobile carrier | 2025 |
| 227-289 | T-Mobile (including Sprint) | Mobile carrier | 2025 |
| 227-314 | AT&T Mobility | Mobile carrier | 2026 |
| 227-722 | Onvoy | Internet / business phone carrier | 2024 |
| 240-210 | AT&T Mobility | Mobile carrier | – |
| 240-213 | Peerless Network Of Maryland | Internet / business phone carrier | – |
| 240-216 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 240-222 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 240-229 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 240-270 | Verizon Wireless | Mobile carrier | 2011 |
| 240-279 | Core Communications | Internet / business phone carrier | – |
| 240-299 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 240-300 | Verizon Wireless | Mobile carrier | 2010 |
| 240-320 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 240-346 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 240-368 | Peerless Network Of Maryland | Internet / business phone carrier | – |
| 240-412 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 240-416 | AT&T Mobility | Mobile carrier | 2001 |
| 240-419 | Verizon Wireless | Mobile carrier | 2007 |
| 240-427 | MCImetro (Verizon Business) | Internet / business phone carrier | 2001 |
| 240-435 | Verizon Wireless | Mobile carrier | 2009 |
| 240-448 | Onvoy | Internet / business phone carrier | – |
| 240-458 | Verizon Wireless | Mobile carrier | 2011 |
| 240-518 | Nuso | Internet / business phone carrier | – |
| 240-530 | Core Communications | Internet / business phone carrier | – |
| 240-585 | Verizon Wireless | Mobile carrier | 2011 |
| 240-607 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 240-640 | AT&T Mobility | Mobile carrier | 2009 |
| 240-682 | Starpower Communications | Phone company | – |
| 240-754 | Level 3 (Lumen) | Internet / business phone carrier | 2011 |
| 301-266 | AT&T Mobility | Mobile carrier | – |
| 301-374 | Verizon (local phone) | Local phone company | – |
| 301-396 | Verizon (local phone) | Local phone company | – |
| 301-399 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 301-535 | AT&T Mobility | Mobile carrier | – |
| 301-542 | Teleport Communications America | Internet / business phone carrier | – |
| 301-553 | Spok | Paging service | – |
| 301-597 | AT&T Mobility | Mobile carrier | 2022 |
| 301-609 | Verizon (local phone) | Local phone company | – |
| 301-632 | Verizon (local phone) | Local phone company | – |
| 301-638 | Verizon (local phone) | Local phone company | – |
| 301-643 | Verizon Wireless | Mobile carrier | – |
| 301-645 | Verizon (local phone) | Local phone company | – |
| 301-653 | AT&T Mobility | Mobile carrier | – |
| 301-659 | AT&T Mobility | Mobile carrier | – |
| 301-705 | Verizon (local phone) | Local phone company | – |
| 301-710 | Level 3 (Lumen) | Internet / business phone carrier | 2005 |
| 301-751 | Verizon Wireless | Mobile carrier | – |
| 301-752 | Verizon Wireless | Mobile carrier | – |
| 301-764 | Verizon (local phone) | Local phone company | – |
| 301-818 | Bandwidth | Internet / business phone carrier | – |
| 301-848 | Verizon Wireless | Mobile carrier | – |
| 301-861 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 301-885 | Verizon (local phone) | Local phone company | – |
| 301-932 | 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.