Phone numbers in Richfield, Utah
Richfield has 10 phone prefixes in area code 435.
Biggest holders: AT&T Mobility, CenturyLink / Lumen, Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 30%
- Local phone company 20%
- Internet / business phone carrier 40%
- Phone company 10%
Every prefix in Richfield
Search the first six digits of a number in this list. If it's here, the number started in Richfield with the carrier shown. If it isn't, check the Utah page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 435-201 | Verizon Wireless | Mobile carrier | – |
| 435-287 | Centracom Interactive | Phone company | 2008 |
| 435-289 | Peerless Network Of Utah | Internet / business phone carrier | 2019 |
| 435-304 | Teleport Communications America | Internet / business phone carrier | – |
| 435-558 | AT&T Mobility | Mobile carrier | 2001 |
| 435-567 | TON80 Communications | Internet / business phone carrier | 2022 |
| 435-633 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 435-893 | CenturyLink / Lumen | Local phone company | – |
| 435-896 | CenturyLink / Lumen | Local phone company | – |
| 435-979 | AT&T Mobility | Mobile carrier | – |
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.