Phone numbers in New Castle, Indiana
New Castle has 18 phone prefixes in area code 765.
Biggest holders: AT&T (local phone), AT&T Mobility, Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 39%
- Local phone company 39%
- Internet / business phone carrier 22%
Every prefix in New Castle
Search the first six digits of a number in this list. If it's here, the number started in New Castle with the carrier shown. If it isn't, check the Indiana page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 765-388 | AT&T Mobility | Mobile carrier | 2003 |
| 765-422 | Peerless Network Of Indiana | Internet / business phone carrier | – |
| 765-465 | Verizon Wireless | Mobile carrier | 2002 |
| 765-515 | AT&T (local phone) | Local phone company | – |
| 765-518 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 765-519 | AT&T (local phone) | Local phone company | – |
| 765-520 | AT&T Mobility | Mobile carrier | 2001 |
| 765-521 | AT&T (local phone) | Local phone company | – |
| 765-524 | Verizon Wireless | Mobile carrier | – |
| 765-527 | AT&T (local phone) | Local phone company | – |
| 765-529 | AT&T (local phone) | Local phone company | – |
| 765-545 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 765-575 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 765-591 | Teleport Communications America | Internet / business phone carrier | – |
| 765-593 | AT&T (local phone) | Local phone company | – |
| 765-599 | AT&T (local phone) | Local phone company | – |
| 765-624 | T-Mobile (including Sprint) | Mobile carrier | 2003 |
| 765-686 | AT&T Mobility | Mobile carrier | 2002 |
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.