| District of California area codes: 858 | |
|---|---|
| Country | United States |
| State/Province | California |
| Major City | San Diego |
| Time Zone | Pacific |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 858-254 | San Diego | San Diego, CA | Sprint Spectrum L.p. |
| 858-255 | San Diego | La Jolla, CA | Teleport Communications America |
| 858-256 | San Diego | San Diego, CA | Cox California Telcom, L.l.c. |
| 858-259 | San Diego | Del Mar, CA | Pacific Bell |
| 858-260 | San Diego | La Jolla, CA | T-mobile Usa |
| 858-263 | San Diego | San Diego, CA | Time Warner Cbl Info Svcs (ca) DBAtime Warner Cbl |
| 858-266 | San Diego | San Diego, CA | Pacific Bell |
| 858-268 | San Diego | San Diego, CA | Pacific Bell |
| 858-270 | San Diego | La Jolla, CA | Pacific Bell |
| 858-271 | San Diego | San Diego, CA | Pacific Bell |
| 858-272 | San Diego | La Jolla, CA | Pacific Bell |
| 858-273 | San Diego | La Jolla, CA | Pacific Bell |
| 858-274 | San Diego | La Jolla, CA | Pacific Bell |
| 858-275 | San Diego | San Diego, CA | Cellco Partnership DBA Verizon Wireless |
| 858-277 | San Diego | San Diego, CA | Pacific Bell |
| 858-278 | San Diego | San Diego, CA | Pacific Bell |
| 858-279 | San Diego | San Diego, CA | Pacific Bell |
| 858-281 | San Diego | San Diego, CA | Level 3 Communications |
| 858-284 | Bandwidth.com Clec | ||
| 858-292 | San Diego | San Diego, CA | Pacific Bell |
There are 389 prefixes, In the code area, the major cities are Poway, CA. The major city is San Diego.