Phone numbers in Dundalk, Maryland
Dundalk has 19 phone prefixes in area codes 410, 443, 667.
Biggest holders: Verizon (local phone), Windstream (PAETEC), MCImetro (Verizon Business). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 16%
- Local phone company 26%
- Internet / business phone carrier 58%
Every prefix in Dundalk
Search the first six digits of a number in this list. If it's here, the number started in Dundalk with the carrier shown. If it isn't, check the Maryland page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 410-282 | Verizon (local phone) | Local phone company | – |
| 410-284 | Verizon (local phone) | Local phone company | – |
| 410-285 | Verizon (local phone) | Local phone company | – |
| 410-288 | Verizon (local phone) | Local phone company | – |
| 410-650 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 443-216 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 443-376 | Teleport Communications America | Internet / business phone carrier | – |
| 443-399 | Onvoy | Internet / business phone carrier | – |
| 443-407 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 443-503 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 443-530 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 443-549 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 443-586 | Core Communications | Internet / business phone carrier | – |
| 443-696 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 443-879 | Verizon (local phone) | Local phone company | – |
| 667-263 | AT&T Mobility | Mobile carrier | 2020 |
| 667-456 | AT&T Mobility | Mobile carrier | 2023 |
| 667-501 | AT&T Mobility | Mobile carrier | 2024 |
| 667-856 | TON80 Communications | Internet / business phone 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.