Phone numbers in Greenfield, Missouri
Greenfield has 3 phone prefixes in area code 417.
Biggest holders: Rystec, Brightspeed Of East Missouri, Mcc Telephony. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 33%
- Internet / business phone carrier 33%
- Phone company 33%
Every prefix in Greenfield
Search the first six digits of a number in this list. If it's here, the number started in Greenfield with the carrier shown. If it isn't, check the Missouri page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 417-564 | Rystec | Phone company | 2004 |
| 417-637 | Brightspeed Of East Missouri | Local phone company | – |
| 417-939 | Mcc Telephony | Internet / business phone carrier | 2005 |
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.