Phone numbers in Del Mar, California
Del Mar has 46 phone prefixes in area codes 619, 858.
Biggest holders: AT&T (local phone), Level 3 (Lumen), T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 17%
- Local phone company 26%
- Internet / business phone carrier 50%
- Paging service 2%
- Phone company 4%
Every prefix in Del Mar
Search the first six digits of a number in this list. If it's here, the number started in Del Mar with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 619-848 | Level 3 (Lumen) | Internet / business phone carrier | 2022 |
| 858-205 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 858-209 | T-Mobile (including Sprint) | Mobile carrier | 2017 |
| 858-252 | T-Mobile (including Sprint) | Mobile carrier | 2014 |
| 858-259 | AT&T (local phone) | Local phone company | – |
| 858-261 | T-Mobile (including Sprint) | Mobile carrier | 2015 |
| 858-280 | AT&T Enterprises | Phone company | 2016 |
| 858-284 | Bandwidth | Internet / business phone carrier | 2014 |
| 858-290 | T-Mobile (including Sprint) | Mobile carrier | 2019 |
| 858-297 | North County Communication | Phone company | – |
| 858-299 | Comcast | Internet / business phone carrier | – |
| 858-306 | Telnyx | Internet / business phone carrier | – |
| 858-313 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 858-314 | Teleport Communications America | Internet / business phone carrier | – |
| 858-342 | AT&T Mobility | Mobile carrier | – |
| 858-345 | Comcast | Internet / business phone carrier | – |
| 858-347 | Spok | Paging service | – |
| 858-350 | AT&T (local phone) | Local phone company | – |
| 858-353 | AT&T Mobility | Mobile carrier | – |
| 858-356 | Tpx Communications | Internet / business phone carrier | – |
| 858-369 | AT&T (local phone) | Local phone company | – |
| 858-393 | Commio | Internet / business phone carrier | 2024 |
| 858-436 | Tpx Communications | Internet / business phone carrier | – |
| 858-461 | Level 3 (Lumen) | Internet / business phone carrier | 2006 |
| 858-465 | Level 3 (Lumen) | Internet / business phone carrier | 2013 |
| 858-480 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 858-481 | AT&T (local phone) | Local phone company | – |
| 858-509 | AT&T (local phone) | Local phone company | – |
| 858-519 | Tpx Communications | Internet / business phone carrier | – |
| 858-523 | AT&T (local phone) | Local phone company | – |
| 858-617 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 858-703 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 858-704 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 858-720 | AT&T (local phone) | Local phone company | – |
| 858-724 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 858-755 | AT&T (local phone) | Local phone company | – |
| 858-764 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 858-792 | AT&T (local phone) | Local phone company | – |
| 858-793 | AT&T (local phone) | Local phone company | – |
| 858-794 | AT&T (local phone) | Local phone company | – |
| 858-847 | AT&T (local phone) | Local phone company | – |
| 858-876 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 858-925 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 858-933 | Fractel | Internet / business phone carrier | 2021 |
| 858-947 | Matrix Telecom, Llc. S/i/i Tnci | Internet / business phone carrier | – |
| 858-977 | Fractel | 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.