Phone numbers in Dupo, Illinois
Dupo has 3 phone prefixes in area code 618.
Biggest holders: Harrisonville Tel, Charter / Spectrum, MetroPCS (T-Mobile). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 33%
- Internet / business phone carrier 33%
- Phone company 33%
Every prefix in Dupo
Search the first six digits of a number in this list. If it's here, the number started in Dupo with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 618-286 | Harrisonville Tel | Phone company | – |
| 618-601 | Charter / Spectrum | Internet / business phone carrier | 2012 |
| 618-906 | MetroPCS (T-Mobile) | Mobile carrier | 2022 |
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.