Phone numbers in Columbia, Maryland
Columbia has 64 phone prefixes in area codes 410, 443, 667.
Biggest holders: Verizon (local phone), Windstream (PAETEC), Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 22%
- Local phone company 33%
- Internet / business phone carrier 42%
- Paging service 2%
- Phone company 2%
Every prefix in Columbia
Search the first six digits of a number in this list. If it's here, the number started in Columbia with the carrier shown. If it isn't, check the Maryland page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 410-290 | Verizon (local phone) | Local phone company | – |
| 410-309 | Verizon (local phone) | Local phone company | – |
| 410-312 | Verizon (local phone) | Local phone company | – |
| 410-381 | Verizon (local phone) | Local phone company | – |
| 410-423 | Teleport Communications America | Internet / business phone carrier | – |
| 410-447 | Spok | Paging service | – |
| 410-531 | Verizon (local phone) | Local phone company | – |
| 410-707 | Verizon Wireless | Mobile carrier | – |
| 410-715 | Verizon (local phone) | Local phone company | – |
| 410-730 | Verizon (local phone) | Local phone company | – |
| 410-740 | Verizon (local phone) | Local phone company | – |
| 410-772 | Verizon (local phone) | Local phone company | – |
| 410-794 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 410-872 | Verizon (local phone) | Local phone company | – |
| 410-884 | Verizon (local phone) | Local phone company | – |
| 410-910 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 410-953 | Verizon (local phone) | Local phone company | – |
| 410-964 | Verizon (local phone) | Local phone company | – |
| 410-992 | Verizon (local phone) | Local phone company | – |
| 410-997 | Verizon (local phone) | Local phone company | – |
| 443-259 | Verizon (local phone) | Local phone company | – |
| 443-276 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 443-283 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 443-285 | Verizon (local phone) | Local phone company | – |
| 443-319 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 443-367 | Verizon (local phone) | Local phone company | – |
| 443-393 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 443-430 | MCImetro (Verizon Business) | Internet / business phone carrier | 2001 |
| 443-472 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 443-518 | Verizon (local phone) | Local phone company | 2008 |
| 443-535 | Verizon (local phone) | Local phone company | – |
| 443-537 | Verizon Wireless | Mobile carrier | – |
| 443-538 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 443-539 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 443-542 | Comcast | Internet / business phone carrier | – |
| 443-545 | Level 3 (Lumen) | Internet / business phone carrier | 2001 |
| 443-546 | Verizon (local phone) | Local phone company | – |
| 443-583 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 443-656 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 443-718 | Windstream (PAETEC) | Internet / business phone carrier | 2008 |
| 443-741 | MCImetro (Verizon Business) | Internet / business phone carrier | 2011 |
| 443-745 | Verizon Wireless | Mobile carrier | – |
| 443-766 | Windstream (PAETEC) | Internet / business phone carrier | 2005 |
| 443-774 | AT&T Mobility | Mobile carrier | 2018 |
| 443-812 | Verizon Wireless | Mobile carrier | 2001 |
| 443-832 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 443-864 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 443-878 | Verizon Wireless | Mobile carrier | – |
| 443-896 | Teleport Communications America | Internet / business phone carrier | – |
| 443-917 | Onvoy | Internet / business phone carrier | 2011 |
| 443-979 | Verizon Wireless | Mobile carrier | 2011 |
| 667-200 | Onvoy | Internet / business phone carrier | 2015 |
| 667-240 | Barr Tell USA | Phone company | 2016 |
| 667-257 | Vonage America | Internet / business phone carrier | 2018 |
| 667-261 | AT&T Mobility | Mobile carrier | 2019 |
| 667-300 | Core Communications | Internet / business phone carrier | 2018 |
| 667-359 | Bandwidth | Internet / business phone carrier | 2021 |
| 667-421 | Telnyx | Internet / business phone carrier | – |
| 667-447 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 667-502 | AT&T Mobility | Mobile carrier | 2024 |
| 667-550 | AT&T Mobility | Mobile carrier | 2026 |
| 667-554 | AT&T Mobility | Mobile carrier | 2026 |
| 667-678 | Onvoy | Internet / business phone carrier | 2021 |
| 667-786 | Teleport Communications America | Internet / business phone carrier | 2015 |
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.