Phone numbers in Madrid, Iowa
Madrid has 3 phone prefixes in area code 515.
Biggest holders: Windstream Iowa Communications, Inc. - Systems, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 67%
- Internet / business phone carrier 33%
Every prefix in Madrid
Search the first six digits of a number in this list. If it's here, the number started in Madrid with the carrier shown. If it isn't, check the Iowa page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 515-582 | Windstream Iowa Communications, Inc. - Systems | Local phone company | 2016 |
| 515-714 | Onvoy | Internet / business phone carrier | 2024 |
| 515-795 | Windstream Iowa Communications, Inc. - Systems | Local 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.