| District of California area codes: 650 | |
|---|---|
| Country | United States |
| State/Province | California |
| Major City | San Jose |
| Time Zone | Pacific (UTC-08:00) |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 650-686 | San Francisco | San Francisco, CA | Mcimetro Access Transmission Services LLC |
| 650-687 | Santa Clara | Palo Alto, CA | Mci Worldcom Communications, Ca |
| 650-688 | Santa Clara | Palo Alto, CA | Pacific Bell |
| 650-689 | San Francisco | San Francisco, CA | Teleport Communications Group - San Francisco |
| 650-690 | Santa Clara | Palo Alto, CA | AT&T Local |
| 650-691 | Santa Clara | Mountain View, CA | Pacific Bell |
| 650-692 | San Mateo | Millbrae, CA | Pacific Bell |
| 650-693 | Santa Clara | Mountain View, CA | Broadwing Communications |
| 650-694 | Santa Clara | Mountain View, CA | Pacific Bell |
| 650-696 | San Mateo | San Mateo, CA | Pacific Bell |
| 650-697 | San Mateo | Millbrae, CA | Pacific Bell |
| 650-701 | San Mateo | Redwood City, CA | Pacific Bell |
| 650-703 | San Mateo | San Mateo, CA | New Cingular Wireless PCS |
| 650-704 | Santa Clara | Palo Alto, CA | New Cingular Wireless PCS |
| 650-712 | San Mateo | Half Moon Bay, CA | Pacific Bell |
| 650-713 | San Mateo | Half Moon Bay, CA | Allegiance Telecom |
| 650-714 | Santa Clara | Palo Alto, CA | New Cingular Wireless PCS |
| 650-716 | San Mateo | Redwood City, CA | Xo California |
| 650-718 | San Mateo | Moss Beach, CA | Teleport Communications Group - San Francisco |
| 650-719 | San Mateo | Moss Beach, CA | Allegiance Telecom |
There are 597 prefixes, In the code area, the major cities are Belmont, CA;Burlingame, CA;Daly City, CA;East Palo. The major city is San Jose.