Phone numbers in Monticello, Iowa
Monticello has 4 phone prefixes in area code 319.
Biggest holders: CenturyLink / Lumen, T-Mobile (including Sprint), Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 25%
- Local phone company 25%
- Internet / business phone carrier 50%
Every prefix in Monticello
Search the first six digits of a number in this list. If it's here, the number started in Monticello with the carrier shown. If it isn't, check the Iowa page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 319-465 | CenturyLink / Lumen | Local phone company | – |
| 319-496 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
| 319-820 | Level 3 (Lumen) | Internet / business phone carrier | 2010 |
| 319-844 | Mcc Telephony | Internet / business phone carrier | 2010 |
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.