Phone numbers in Clear Lake, Minnesota
Clear Lake has 4 phone prefixes in area code 320.
Biggest holders: AT&T Mobility, Frontier. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 75%
- Local phone company 25%
Every prefix in Clear Lake
Search the first six digits of a number in this list. If it's here, the number started in Clear Lake with the carrier shown. If it isn't, check the Minnesota page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 320-319 | AT&T Mobility | Mobile carrier | 2017 |
| 320-447 | AT&T Mobility | Mobile carrier | 2021 |
| 320-479 | AT&T Mobility | Mobile carrier | 2024 |
| 320-743 | 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.