Phone numbers in Monticello, Utah
Monticello has 4 phone prefixes in area code 435.
Biggest holders: Verizon Wireless, E. Fiber San Juan, Frontier. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 50%
- Local phone company 25%
- Internet / business phone carrier 25%
Every prefix in Monticello
Search the first six digits of a number in this list. If it's here, the number started in Monticello with the carrier shown. If it isn't, check the Utah page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 435-298 | E. Fiber San Juan | Internet / business phone carrier | 2021 |
| 435-419 | Verizon Wireless | Mobile carrier | – |
| 435-459 | Verizon Wireless | Mobile carrier | – |
| 435-587 | Frontier | 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.