Phone numbers in Sykesville, Maryland
Sykesville has 17 phone prefixes in area codes 410, 443, 667.
Biggest holders: Verizon (local phone), MetroPCS (T-Mobile), Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 24%
- Local phone company 24%
- Internet / business phone carrier 53%
Every prefix in Sykesville
Search the first six digits of a number in this list. If it's here, the number started in Sykesville with the carrier shown. If it isn't, check the Maryland page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 410-549 | Verizon (local phone) | Local phone company | – |
| 410-552 | Verizon (local phone) | Local phone company | – |
| 410-795 | Verizon (local phone) | Local phone company | – |
| 410-875 | Verizon (local phone) | Local phone company | – |
| 410-970 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 410-984 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 443-277 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 443-280 | AT&T Mobility | Mobile carrier | – |
| 443-300 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 443-328 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 443-361 | Core Communications | Internet / business phone carrier | – |
| 443-398 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 443-516 | Onvoy | Internet / business phone carrier | – |
| 443-609 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 443-920 | Teleport Communications America | Internet / business phone carrier | – |
| 667-339 | Onvoy | Internet / business phone carrier | 2021 |
| 667-478 | Onvoy | Internet / business phone carrier | 2024 |
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.