Phone numbers in Dubuque, Iowa
Dubuque has 36 phone prefixes in area code 563.
Biggest holders: CenturyLink / Lumen, UScellular, T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 50%
- Local phone company 33%
- Internet / business phone carrier 17%
Every prefix in Dubuque
Search the first six digits of a number in this list. If it's here, the number started in Dubuque with the carrier shown. If it isn't, check the Iowa page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 563-207 | AT&T Mobility | Mobile carrier | 2016 |
| 563-213 | T-Mobile (including Sprint) | Mobile carrier | – |
| 563-216 | Verizon Wireless | Mobile carrier | 2023 |
| 563-227 | Mcc Telephony Of Iowa | Internet / business phone carrier | 2018 |
| 563-231 | UScellular | Mobile carrier | 2012 |
| 563-235 | Verizon Wireless | Mobile carrier | 2015 |
| 563-239 | Mcc Telephony Of Iowa | Internet / business phone carrier | 2016 |
| 563-258 | AT&T Mobility | Mobile carrier | 2011 |
| 563-291 | Onvoy | Internet / business phone carrier | 2021 |
| 563-307 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
| 563-341 | UScellular | Mobile carrier | 2022 |
| 563-348 | Fractel | Internet / business phone carrier | 2020 |
| 563-451 | AT&T (local phone) | Local phone company | – |
| 563-495 | T-Mobile (including Sprint) | Mobile carrier | – |
| 563-500 | Fractel | Internet / business phone carrier | 2019 |
| 563-513 | UScellular | Mobile carrier | 2001 |
| 563-542 | UScellular | Mobile carrier | 2001 |
| 563-543 | UScellular | Mobile carrier | – |
| 563-552 | CenturyLink / Lumen | Local phone company | – |
| 563-556 | CenturyLink / Lumen | Local phone company | – |
| 563-557 | CenturyLink / Lumen | Local phone company | – |
| 563-564 | T-Mobile (including Sprint) | Mobile carrier | – |
| 563-580 | Verizon Wireless | Mobile carrier | – |
| 563-581 | Verizon Wireless | Mobile carrier | – |
| 563-582 | CenturyLink / Lumen | Local phone company | – |
| 563-583 | CenturyLink / Lumen | Local phone company | – |
| 563-584 | CenturyLink / Lumen | Local phone company | – |
| 563-585 | CenturyLink / Lumen | Local phone company | – |
| 563-587 | CenturyLink / Lumen | Local phone company | – |
| 563-588 | CenturyLink / Lumen | Local phone company | – |
| 563-589 | CenturyLink / Lumen | Local phone company | – |
| 563-590 | UScellular | Mobile carrier | – |
| 563-599 | UScellular | Mobile carrier | – |
| 563-663 | AT&T Mobility | Mobile carrier | 2001 |
| 563-690 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 563-845 | AT&T (local phone) | Local phone company | 2009 |
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.