Phone numbers in Essex, Maryland
Essex has 30 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 17%
- Local phone company 37%
- Internet / business phone carrier 47%
Every prefix in Essex
Search the first six digits of a number in this list. If it's here, the number started in Essex with the carrier shown. If it isn't, check the Maryland page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 410-238 | Verizon (local phone) | Local phone company | – |
| 410-391 | Verizon (local phone) | Local phone company | – |
| 410-406 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 410-574 | Verizon (local phone) | Local phone company | – |
| 410-682 | Verizon (local phone) | Local phone company | – |
| 410-686 | Verizon (local phone) | Local phone company | – |
| 410-687 | Verizon (local phone) | Local phone company | – |
| 410-780 | Verizon (local phone) | Local phone company | – |
| 410-866 | Verizon (local phone) | Local phone company | – |
| 410-918 | Verizon (local phone) | Local phone company | – |
| 443-231 | Teleport Communications America | Internet / business phone carrier | – |
| 443-460 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 443-505 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 443-559 | Comcast | Internet / business phone carrier | – |
| 443-579 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 443-596 | Core Communications | Internet / business phone carrier | – |
| 443-600 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 443-648 | Teleport Communications America | Internet / business phone carrier | – |
| 443-730 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 443-772 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 443-777 | Verizon (local phone) | Local phone company | – |
| 443-815 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 443-868 | Verizon (local phone) | Local phone company | – |
| 443-969 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 667-304 | Bandwidth | Internet / business phone carrier | 2021 |
| 667-328 | AT&T Mobility | Mobile carrier | 2021 |
| 667-378 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 667-416 | Bandwidth | Internet / business phone carrier | 2022 |
| 667-442 | AT&T Mobility | Mobile carrier | 2023 |
| 667-537 | AT&T Mobility | Mobile carrier | 2026 |
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.