Phone numbers in Fairfax, Iowa
Fairfax has 3 phone prefixes in area code 319.
Biggest holders: South Slope Coop. Tel, Mcc Telephony. This is the local calling area (rate center) where those prefixes were first assigned.
- Internet / business phone carrier 33%
- Phone company 67%
Every prefix in Fairfax
Search the first six digits of a number in this list. If it's here, the number started in Fairfax with the carrier shown. If it isn't, check the Iowa page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 319-357 | Mcc Telephony | Internet / business phone carrier | 2006 |
| 319-845 | South Slope Coop. Tel | Phone company | – |
| 319-846 | South Slope Coop. Tel | 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.