Phone numbers in Union, Missouri
Union has 12 phone prefixes in area code 636.
Biggest holders: AT&T Mobility, AT&T (local phone), Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 33%
- Local phone company 25%
- Internet / business phone carrier 33%
- Phone company 8%
Every prefix in Union
Search the first six digits of a number in this list. If it's here, the number started in Union with the carrier shown. If it isn't, check the Missouri page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 636-210 | AT&T Mobility | Mobile carrier | 2020 |
| 636-234 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 636-249 | MetroPCS (T-Mobile) | Mobile carrier | 2014 |
| 636-286 | AT&T Mobility | Mobile carrier | 2024 |
| 636-303 | Telnyx | Internet / business phone carrier | 2017 |
| 636-388 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 636-582 | Aurora Communications | Phone company | 2008 |
| 636-583 | AT&T (local phone) | Local phone company | – |
| 636-584 | AT&T (local phone) | Local phone company | – |
| 636-649 | AT&T Mobility | Mobile carrier | 2011 |
| 636-666 | Terra Nova Telecom | Internet / business phone carrier | 2018 |
| 636-744 | AT&T (local phone) | Local phone company | 2006 |
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.