Phone numbers in Middlebury, Indiana
Middlebury has 5 phone prefixes in area code 574.
Biggest holders: T-Mobile (including Sprint), TON80 Communications, Twilio. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 20%
- Local phone company 20%
- Internet / business phone carrier 60%
Every prefix in Middlebury
Search the first six digits of a number in this list. If it's here, the number started in Middlebury with the carrier shown. If it isn't, check the Indiana page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 574-358 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 574-663 | TON80 Communications | Internet / business phone carrier | 2022 |
| 574-821 | Twilio | Internet / business phone carrier | – |
| 574-822 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 574-825 | 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.