Phone numbers in St. Croix, U.S. Virgin Islands
St. Croix has 7 phone prefixes in area code 340.
Biggest holders: T-Mobile (including Sprint), Lumen Technolgies St. Croix, AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 71%
- Local phone company 14%
- Internet / business phone carrier 14%
Every prefix in St. Croix
Search the first six digits of a number in this list. If it's here, the number started in St. Croix with the carrier shown. If it isn't, check the U.S. Virgin Islands page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 340-202 | Lumen Technolgies St. Croix | Internet / business phone carrier | 2018 |
| 340-206 | AT&T Mobility | Mobile carrier | 2022 |
| 340-208 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 340-226 | MetroPCS (T-Mobile) | Mobile carrier | 2007 |
| 340-277 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 340-332 | T-Mobile (including Sprint) | Mobile carrier | 2003 |
| 340-692 | Innovative Telephone | 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.