Phone numbers in Randallstown, Maryland
Randallstown has 16 phone prefixes in area codes 410, 443, 667.
Biggest holders: Verizon (local phone), Windstream (PAETEC), T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 19%
- Local phone company 25%
- Internet / business phone carrier 56%
Every prefix in Randallstown
Search the first six digits of a number in this list. If it's here, the number started in Randallstown with the carrier shown. If it isn't, check the Maryland page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 410-496 | Verizon (local phone) | Local phone company | – |
| 410-521 | Verizon (local phone) | Local phone company | – |
| 410-655 | Verizon (local phone) | Local phone company | – |
| 410-701 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 410-922 | Verizon (local phone) | Local phone company | – |
| 443-272 | Teleport Communications America | Internet / business phone carrier | – |
| 443-405 | Comcast | Internet / business phone carrier | – |
| 443-426 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 443-431 | Core Communications | Internet / business phone carrier | – |
| 443-565 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 443-576 | MCImetro (Verizon Business) | Internet / business phone carrier | 2001 |
| 443-657 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 443-675 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 443-985 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 667-324 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 667-390 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
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.