Phone numbers in Casa Grande, Arizona
Casa Grande has 67 phone prefixes in area code 520.
Biggest holders: T-Mobile (including Sprint), CenturyLink / Lumen, Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 54%
- Local phone company 27%
- Internet / business phone carrier 18%
- Phone company 1%
Every prefix in Casa Grande
Search the first six digits of a number in this list. If it's here, the number started in Casa Grande with the carrier shown. If it isn't, check the Arizona page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 520-208 | Level 3 (Lumen) | Internet / business phone carrier | 2001 |
| 520-213 | T-Mobile (including Sprint) | Mobile carrier | 2013 |
| 520-217 | CenturyLink / Lumen | Local phone company | 2015 |
| 520-233 | Onvoy | Internet / business phone carrier | – |
| 520-251 | T-Mobile (including Sprint) | Mobile carrier | – |
| 520-252 | T-Mobile (including Sprint) | Mobile carrier | – |
| 520-280 | T-Mobile (including Sprint) | Mobile carrier | – |
| 520-316 | CenturyLink / Lumen | Local phone company | – |
| 520-340 | Verizon Wireless | Mobile carrier | 2016 |
| 520-350 | Gila Local Exchange Carrier | Phone company | 2008 |
| 520-371 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 520-374 | CenturyLink / Lumen | Local phone company | – |
| 520-380 | T-Mobile (including Sprint) | Mobile carrier | 2019 |
| 520-381 | Allstream | Internet / business phone carrier | – |
| 520-413 | Level 3 (Lumen) | Internet / business phone carrier | 2001 |
| 520-414 | Level 3 (Lumen) | Internet / business phone carrier | 2001 |
| 520-421 | CenturyLink / Lumen | Local phone company | – |
| 520-423 | CenturyLink / Lumen | Local phone company | – |
| 520-424 | CenturyLink / Lumen | Local phone company | – |
| 520-426 | CenturyLink / Lumen | Local phone company | – |
| 520-431 | AT&T Mobility | Mobile carrier | – |
| 520-450 | T-Mobile (including Sprint) | Mobile carrier | – |
| 520-464 | CenturyLink / Lumen | Local phone company | – |
| 520-466 | CenturyLink / Lumen | Local phone company | – |
| 520-472 | CenturyLink / Lumen | Local phone company | 2019 |
| 520-483 | Verizon Wireless | Mobile carrier | – |
| 520-494 | CenturyLink / Lumen | Local phone company | – |
| 520-509 | Level 3 (Lumen) | Internet / business phone carrier | 2001 |
| 520-510 | AT&T Mobility | Mobile carrier | – |
| 520-518 | AT&T Mobility | Mobile carrier | – |
| 520-532 | Onvoy | Internet / business phone carrier | 2020 |
| 520-553 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 520-557 | Commio | Internet / business phone carrier | 2022 |
| 520-560 | AT&T Mobility | Mobile carrier | – |
| 520-568 | CenturyLink / Lumen | Local phone company | – |
| 520-582 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 520-598 | MetroPCS (T-Mobile) | Mobile carrier | 2021 |
| 520-607 | AT&T Mobility | Mobile carrier | 2021 |
| 520-632 | Verizon Wireless | Mobile carrier | 2021 |
| 520-634 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
| 520-635 | T-Mobile (including Sprint) | Mobile carrier | 2015 |
| 520-637 | T-Mobile (including Sprint) | Mobile carrier | 2020 |
| 520-660 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
| 520-666 | Onvoy | Internet / business phone carrier | 2017 |
| 520-677 | Boost / Virgin Mobile | Mobile carrier | 2023 |
| 520-683 | Onvoy | Internet / business phone carrier | 2023 |
| 520-688 | Fractel | Internet / business phone carrier | 2021 |
| 520-701 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 520-705 | Verizon Wireless | Mobile carrier | – |
| 520-709 | Verizon Wireless | Mobile carrier | – |
| 520-723 | CenturyLink / Lumen | Local phone company | – |
| 520-728 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
| 520-736 | AT&T Mobility | Mobile carrier | 2024 |
| 520-752 | Verizon Wireless | Mobile carrier | 2025 |
| 520-757 | T-Mobile (including Sprint) | Mobile carrier | 2025 |
| 520-759 | Verizon Wireless | Mobile carrier | 2018 |
| 520-763 | T-Mobile (including Sprint) | Mobile carrier | 2025 |
| 520-764 | T-Mobile (including Sprint) | Mobile carrier | 2025 |
| 520-765 | T-Mobile (including Sprint) | Mobile carrier | 2026 |
| 520-767 | AT&T Mobility | Mobile carrier | 2026 |
| 520-788 | T-Mobile (including Sprint) | Mobile carrier | 2014 |
| 520-836 | CenturyLink / Lumen | Local phone company | – |
| 520-840 | Verizon Wireless | Mobile carrier | – |
| 520-858 | CenturyLink / Lumen | Local phone company | 2007 |
| 520-866 | CenturyLink / Lumen | Local phone company | 2001 |
| 520-868 | CenturyLink / Lumen | Local phone company | – |
| 520-876 | CenturyLink / Lumen | 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.