Phone numbers in Porterville, California
Porterville has 29 phone prefixes in area code 559.
Biggest holders: AT&T (local phone), AT&T Mobility, T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 38%
- Local phone company 28%
- Internet / business phone carrier 31%
- Paging service 3%
Every prefix in Porterville
Search the first six digits of a number in this list. If it's here, the number started in Porterville with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 559-202 | T-Mobile (including Sprint) | Mobile carrier | – |
| 559-204 | American Messaging Services | Paging service | – |
| 559-306 | T-Mobile (including Sprint) | Mobile carrier | – |
| 559-310 | AT&T Mobility | Mobile carrier | 2001 |
| 559-333 | T-Mobile (including Sprint) | Mobile carrier | – |
| 559-339 | Tpx Communications | Internet / business phone carrier | – |
| 559-350 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 559-359 | AT&T Mobility | Mobile carrier | – |
| 559-361 | AT&T Mobility | Mobile carrier | – |
| 559-544 | Teleport Communications America | Internet / business phone carrier | 2010 |
| 559-560 | Onvoy | Internet / business phone carrier | – |
| 559-576 | Bandwidth | Internet / business phone carrier | 2021 |
| 559-615 | Charter / Spectrum | Internet / business phone carrier | 2016 |
| 559-719 | AT&T Mobility | Mobile carrier | – |
| 559-756 | AT&T Mobility | Mobile carrier | – |
| 559-781 | AT&T (local phone) | Local phone company | – |
| 559-782 | AT&T (local phone) | Local phone company | – |
| 559-783 | AT&T (local phone) | Local phone company | – |
| 559-784 | AT&T (local phone) | Local phone company | – |
| 559-788 | AT&T (local phone) | Local phone company | – |
| 559-789 | AT&T (local phone) | Local phone company | – |
| 559-791 | AT&T (local phone) | Local phone company | – |
| 559-792 | Onvoy | Internet / business phone carrier | – |
| 559-793 | AT&T (local phone) | Local phone company | – |
| 559-853 | Level 3 (Lumen) | Internet / business phone carrier | 2005 |
| 559-854 | Peerless Network Of California | Internet / business phone carrier | – |
| 559-883 | AT&T Mobility | Mobile carrier | 2024 |
| 559-920 | Verizon Wireless | Mobile carrier | – |
| 559-982 | Bandwidth | Internet / business phone carrier | 2026 |
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.