Phone numbers in Waterloo, Iowa
Waterloo has 47 phone prefixes in area code 319.
Biggest holders: CenturyLink / Lumen, UScellular, Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 53%
- Local phone company 34%
- Internet / business phone carrier 11%
- Phone company 2%
Every prefix in Waterloo
Search the first six digits of a number in this list. If it's here, the number started in Waterloo with the carrier shown. If it isn't, check the Iowa page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 319-215 | UScellular | Mobile carrier | 2004 |
| 319-226 | CenturyLink / Lumen | Local phone company | – |
| 319-229 | AT&T Mobility | Mobile carrier | 2014 |
| 319-230 | Verizon Wireless | Mobile carrier | – |
| 319-231 | UScellular | Mobile carrier | – |
| 319-232 | CenturyLink / Lumen | Local phone company | – |
| 319-233 | CenturyLink / Lumen | Local phone company | – |
| 319-234 | CenturyLink / Lumen | Local phone company | – |
| 319-235 | CenturyLink / Lumen | Local phone company | – |
| 319-236 | CenturyLink / Lumen | Local phone company | – |
| 319-239 | UScellular | Mobile carrier | – |
| 319-240 | UScellular | Mobile carrier | – |
| 319-252 | AT&T Mobility | Mobile carrier | 2016 |
| 319-269 | UScellular | Mobile carrier | – |
| 319-272 | CenturyLink / Lumen | Local phone company | – |
| 319-274 | CenturyLink / Lumen | Local phone company | – |
| 319-287 | CenturyLink / Lumen | Local phone company | – |
| 319-290 | Verizon Wireless | Mobile carrier | – |
| 319-291 | CenturyLink / Lumen | Local phone company | – |
| 319-292 | CenturyLink / Lumen | Local phone company | – |
| 319-296 | CenturyLink / Lumen | Local phone company | – |
| 319-300 | T-Mobile (including Sprint) | Mobile carrier | 2018 |
| 319-340 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
| 319-348 | Fractel | Internet / business phone carrier | 2019 |
| 319-349 | Integrated Path Communcations | Phone company | 2015 |
| 319-404 | UScellular | Mobile carrier | – |
| 319-415 | UScellular | Mobile carrier | 2001 |
| 319-420 | Onvoy | Internet / business phone carrier | 2023 |
| 319-427 | Verizon Wireless | Mobile carrier | – |
| 319-429 | UScellular | Mobile carrier | 2007 |
| 319-433 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 319-464 | AT&T (local phone) | Local phone company | – |
| 319-486 | T-Mobile (including Sprint) | Mobile carrier | 2011 |
| 319-493 | T-Mobile (including Sprint) | Mobile carrier | – |
| 319-502 | Level 3 (Lumen) | Internet / business phone carrier | 2024 |
| 319-504 | T-Mobile (including Sprint) | Mobile carrier | – |
| 319-505 | Verizon Wireless | Mobile carrier | 2012 |
| 319-529 | Verizon Wireless | Mobile carrier | 2010 |
| 319-595 | Mcc Telephony | Internet / business phone carrier | 2018 |
| 319-610 | AT&T Mobility | Mobile carrier | 2001 |
| 319-830 | Verizon Wireless | Mobile carrier | – |
| 319-833 | CenturyLink / Lumen | Local phone company | – |
| 319-874 | CenturyLink / Lumen | Local phone company | – |
| 319-883 | Verizon Wireless | Mobile carrier | 2009 |
| 319-888 | CenturyLink / Lumen | Local phone company | – |
| 319-939 | UScellular | Mobile carrier | – |
| 319-961 | T-Mobile (including Sprint) | Mobile carrier | – |
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.