Phone numbers in Rio Grande, Ohio
Rio Grande has 3 phone prefixes in area code 740.
Biggest holders: AT&T (local phone), Peerless Network Of Ohio, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 33%
- Internet / business phone carrier 67%
Every prefix in Rio Grande
Search the first six digits of a number in this list. If it's here, the number started in Rio Grande with the carrier shown. If it isn't, check the Ohio page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 740-245 | AT&T (local phone) | Local phone company | – |
| 740-301 | Peerless Network Of Ohio | Internet / business phone carrier | 2002 |
| 740-560 | Onvoy | Internet / business phone carrier | 2016 |
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.