Phone numbers in Westminster, Maryland
Westminster has 28 phone prefixes in area codes 410, 443, 667.
Biggest holders: Verizon Wireless, Verizon (local phone), AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 43%
- Local phone company 21%
- Internet / business phone carrier 25%
- Phone company 11%
Every prefix in Westminster
Search the first six digits of a number in this list. If it's here, the number started in Westminster with the carrier shown. If it isn't, check the Maryland page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 410-259 | Verizon Wireless | Mobile carrier | – |
| 410-386 | Verizon (local phone) | Local phone company | – |
| 410-596 | Verizon Wireless | Mobile carrier | – |
| 410-751 | Verizon (local phone) | Local phone company | – |
| 410-848 | Verizon (local phone) | Local phone company | – |
| 410-857 | Verizon (local phone) | Local phone company | – |
| 410-861 | Verizon (local phone) | Local phone company | – |
| 410-871 | Verizon (local phone) | Local phone company | – |
| 443-201 | AT&T Mobility | Mobile carrier | – |
| 443-241 | Onvoy | Internet / business phone carrier | – |
| 443-244 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 443-289 | MCImetro (Verizon Business) | Internet / business phone carrier | 2011 |
| 443-293 | Verizon Wireless | Mobile carrier | – |
| 443-340 | Verizon Wireless | Mobile carrier | – |
| 443-368 | Core Communications | Internet / business phone carrier | – |
| 443-487 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 443-536 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 443-547 | Verizon Wireless | Mobile carrier | 2009 |
| 443-605 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 443-789 | AT&T Mobility | Mobile carrier | – |
| 443-821 | MetroPCS (T-Mobile) | Mobile carrier | 2010 |
| 443-952 | Verizon Wireless | Mobile carrier | 2011 |
| 443-974 | Teleport Communications America | Internet / business phone carrier | – |
| 667-272 | AT&T Mobility | Mobile carrier | 2019 |
| 667-314 | Barr Tell USA | Phone company | – |
| 667-367 | Baltimore-washington Telephone (bwt) | Phone company | 2015 |
| 667-484 | Boost / Virgin Mobile | Mobile carrier | 2024 |
| 667-788 | Quantum Telecommunications | Phone company | 2021 |
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.