Phone numbers in Madison, Indiana
Madison has 12 phone prefixes in area codes 812, 930.
Biggest holders: Frontier, T-Mobile (including Sprint), AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 50%
- Local phone company 25%
- Internet / business phone carrier 17%
- Phone company 8%
Every prefix in Madison
Search the first six digits of a number in this list. If it's here, the number started in Madison with the carrier shown. If it isn't, check the Indiana page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 812-265 | Frontier | Local phone company | – |
| 812-273 | Frontier | Local phone company | – |
| 812-274 | CenturyLink / Lumen | Local phone company | – |
| 812-292 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 812-493 | AT&T Mobility | Mobile carrier | – |
| 812-574 | Sei Data | Phone company | – |
| 812-599 | Verizon Wireless | Mobile carrier | 2002 |
| 812-701 | AT&T Mobility | Mobile carrier | 2002 |
| 812-801 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 812-818 | Verizon Wireless | Mobile carrier | 2018 |
| 930-217 | T-Mobile (including Sprint) | Mobile carrier | 2020 |
| 930-301 | Onvoy | Internet / business phone carrier | 2026 |
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.