Phone numbers in Chase, Maryland
Chase has 13 phone prefixes in area codes 410, 443, 667.
Biggest holders: T-Mobile (including Sprint), Verizon (local phone), Windstream (PAETEC). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 23%
- Local phone company 15%
- Internet / business phone carrier 62%
Every prefix in Chase
Search the first six digits of a number in this list. If it's here, the number started in Chase with the carrier shown. If it isn't, check the Maryland page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 410-335 | Verizon (local phone) | Local phone company | – |
| 410-344 | Verizon (local phone) | Local phone company | – |
| 410-630 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 443-228 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 443-317 | Bandwidth | Internet / business phone carrier | – |
| 443-489 | Teleport Communications America | Internet / business phone carrier | – |
| 443-554 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 443-581 | Onvoy | Internet / business phone carrier | – |
| 443-626 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 667-344 | Telnyx | Internet / business phone carrier | – |
| 667-375 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 667-443 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 667-657 | Onvoy | Internet / business phone carrier | 2021 |
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.