| District of California area codes: 858 | |
|---|---|
| Country | United States |
| State/Province | California |
| Major City | San Diego |
| Time Zone | Pacific |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 858-200 | San Diego | La Jolla, CA | U.s. Telepacific Corp. |
| 858-201 | San Diego | San Diego, CA | Level 3 Communications |
| 858-202 | San Diego | La Jolla, CA | Pacific Bell |
| 858-204 | San Diego | San Diego, CA | Cellco Partnership DBA Verizon Wireless |
| 858-205 | San Diego | San Diego, CA | T-mobile Usa |
| 858-206 | San Diego | Poway, CA | Ymax Communications Corp. |
| 858-207 | San Diego | Rancho Bernardo, CA | Teleport Communications America |
| 858-208 | San Diego | San Diego, CA | O1 Communications |
| 858-210 | San Diego | La Jolla, CA | Cellco Partnership DBA Verizon Wireless |
| 858-212 | San Diego | San Diego, CA | Sprint Spectrum L.p. |
| 858-213 | San Diego | San Diego, CA | Sprint Spectrum L.p. |
| 858-215 | San Diego | San Diego, CA | Pacific Bell |
| 858-216 | San Diego | San Diego, CA | U.s. Telepacific Corp. |
| 858-217 | San Diego | San Diego, CA | U.s. Telepacific Corp. |
| 858-218 | San Diego | San Diego, CA | U.s. Telepacific Corp. |
| 858-219 | San Diego | San Diego, CA | American Messaging Services |
| 858-220 | San Diego | La Jolla, CA | Sprint Spectrum L.p. |
| 858-222 | San Diego | La Jolla, CA | Ymax Communications Corp. |
| 858-223 | San Diego | San Diego, CA | Onvoy |
| 858-224 | San Diego | San Diego, CA | Cbeyond Communications |
There are 389 prefixes, In the code area, the major cities are Poway, CA. The major city is San Diego.