Phone numbers in New Castle, Delaware
New Castle has 42 phone prefixes in area code 302.
Biggest holders: AT&T Mobility, Verizon (local phone), MCImetro (Verizon Business). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 40%
- Local phone company 19%
- Internet / business phone carrier 33%
- Phone company 7%
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 Delaware page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 302-220 | AT&T Mobility | Mobile carrier | – |
| 302-221 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 302-229 | AT&T Mobility | Mobile carrier | – |
| 302-276 | T-Mobile (including Sprint) | Mobile carrier | 2005 |
| 302-277 | AT&T Mobility | Mobile carrier | 2020 |
| 302-317 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 302-322 | Verizon (local phone) | Local phone company | – |
| 302-323 | Verizon (local phone) | Local phone company | – |
| 302-324 | Verizon (local phone) | Local phone company | – |
| 302-325 | Verizon (local phone) | Local phone company | – |
| 302-326 | Verizon (local phone) | Local phone company | – |
| 302-327 | Verizon (local phone) | Local phone company | – |
| 302-328 | Verizon (local phone) | Local phone company | – |
| 302-356 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 302-367 | AT&T Mobility | Mobile carrier | – |
| 302-370 | MCImetro (Verizon Business) | Internet / business phone carrier | 2004 |
| 302-395 | Verizon (local phone) | Local phone company | – |
| 302-400 | MCImetro (Verizon Business) | Internet / business phone carrier | 2010 |
| 302-413 | MetroPCS (T-Mobile) | Mobile carrier | 2010 |
| 302-414 | MCImetro (Verizon Business) | Internet / business phone carrier | 2010 |
| 302-419 | Teleport Communications America | Internet / business phone carrier | – |
| 302-501 | Teleport Communications America | Internet / business phone carrier | 2013 |
| 302-544 | AT&T Mobility | Mobile carrier | – |
| 302-561 | AT&T Mobility | Mobile carrier | – |
| 302-562 | AT&T Mobility | Mobile carrier | – |
| 302-568 | AT&T Mobility | Mobile carrier | 2021 |
| 302-609 | AT&T Mobility | Mobile carrier | 2022 |
| 302-613 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 302-618 | MCImetro (Verizon Business) | Internet / business phone carrier | 2022 |
| 302-620 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 302-624 | Allpage | Phone company | – |
| 302-639 | Coretel Delaware | Phone company | 2018 |
| 302-669 | Teleport Communications America | Internet / business phone carrier | – |
| 302-689 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 302-713 | AT&T Mobility | Mobile carrier | 2026 |
| 302-740 | AT&T Mobility | Mobile carrier | – |
| 302-743 | AT&T Mobility | Mobile carrier | – |
| 302-750 | AT&T Mobility | Mobile carrier | – |
| 302-753 | AT&T Mobility | Mobile carrier | – |
| 302-787 | Coretel Delaware | Phone company | 2001 |
| 302-800 | Onvoy | Internet / business phone carrier | 2015 |
| 302-991 | Onvoy | Internet / business phone carrier | 2020 |
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.