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| San Francisco The de facto center from which directions to various regions in the Bay Area are made. |
| North Bay Where you arrive when you cross the Golden Gate Bridge from San Francisco and includes Marin, southern Sonoma, southern Napa, and Solano Counties. |
| East Bay Lies across the bay from San Francisco, and includes Contra Costa and Alameda Counties. Oakland is the most populous city in the East Bay, and Berkeley another major destination. |
| Peninsula Stretches south down from San Francisco across San Mateo County and into the northern parts of Santa Clara County. |
| South Bay South of the Peninsula and the East Bay, includes most of Santa Clara County, and is anchored by the most populous city in the Bay Area, San Jose. |
Here's a handy rule of thumb: the telephone area codes 415 and 650 means the Marin and San Francisco Peninsula or the West Bay, 510 and 925 is for the East Bay, 707 for the North Bay or Wine Country and 408 is for the South Bay or the Santa Clara Valley. Note that the boundary between Peninsula and South Bay is not formal; some locals, and some other sites/guides may place some of the northern Santa Clara County cities categorized here as "Peninsula" as South Bay - for example, the local Craigslist does so for Mountain View.
