Phone numbers in Ashton-Sandy Spring, Maryland
Ashton-Sandy Spring has 49 phone prefixes in area codes 227, 240, 301.
Biggest holders: T-Mobile (including Sprint), Verizon (local phone), MCImetro (Verizon Business). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 39%
- Local phone company 14%
- Internet / business phone carrier 41%
- Phone company 6%
Every prefix in Ashton-Sandy Spring
Search the first six digits of a number in this list. If it's here, the number started in Ashton-Sandy Spring with the carrier shown. If it isn't, check the Maryland page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 227-213 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 227-219 | MCImetro (Verizon Business) | Internet / business phone carrier | 2023 |
| 227-243 | Onvoy | Internet / business phone carrier | 2024 |
| 227-282 | T-Mobile (including Sprint) | Mobile carrier | 2025 |
| 227-292 | T-Mobile (including Sprint) | Mobile carrier | 2025 |
| 227-300 | T-Mobile (including Sprint) | Mobile carrier | 2025 |
| 227-315 | Bandwidth | Internet / business phone carrier | 2026 |
| 227-777 | Wide Voice | Phone company | 2023 |
| 240-324 | Ymax Communications | Phone company | 2008 |
| 240-342 | Starpower Communications | Phone company | – |
| 240-345 | Level 3 (Lumen) | Internet / business phone carrier | 2006 |
| 240-389 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 240-390 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 240-437 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 240-536 | Peerless Network Of Maryland | Internet / business phone carrier | – |
| 240-559 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 240-570 | Onvoy | Internet / business phone carrier | 2016 |
| 240-579 | T-Mobile (including Sprint) | Mobile carrier | 2018 |
| 240-596 | Core Communications | Internet / business phone carrier | 2018 |
| 240-659 | T-Mobile (including Sprint) | Mobile carrier | 2019 |
| 240-703 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 240-722 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-729 | T-Mobile (including Sprint) | Mobile carrier | 2020 |
| 240-733 | Fractel | Internet / business phone carrier | 2020 |
| 240-779 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 240-797 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 240-817 | T-Mobile (including Sprint) | Mobile carrier | 2016 |
| 240-820 | Onvoy | Internet / business phone carrier | 2021 |
| 240-859 | Onvoy | Internet / business phone carrier | 2016 |
| 240-861 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 240-883 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 240-887 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 240-918 | T-Mobile (including Sprint) | Mobile carrier | 2016 |
| 240-919 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
| 240-936 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
| 240-938 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 240-978 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 240-991 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 301-232 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 301-260 | Verizon (local phone) | Local phone company | – |
| 301-329 | Onvoy | Internet / business phone carrier | – |
| 301-421 | Verizon (local phone) | Local phone company | – |
| 301-476 | Verizon (local phone) | Local phone company | – |
| 301-549 | Verizon (local phone) | Local phone company | – |
| 301-570 | Verizon (local phone) | Local phone company | – |
| 301-658 | Teleport Communications America | Internet / business phone carrier | – |
| 301-774 | Verizon (local phone) | Local phone company | – |
| 301-804 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 301-854 | Verizon (local phone) | Local phone company | – |
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.