650 Area Code: Daly City, California

San Francisco's mid-Peninsula falls inside the 650 area code, with Daly City as the primary city in the directory's records. Daly City sits on the ocean side of the peninsula immediately south of San Francisco, where the coastal hills meet the city line, and the broader 650 footprint runs through San Mateo County and the southern Peninsula cities — South San Francisco, San Mateo, Redwood City, Palo Alto, and Mountain View among them. The corridor includes a substantial slice of what became Silicon Valley, with several long-running technology campuses and the airport that handles much of the Bay Area's international traffic.

Other California cities — Anaheim, Bakersfield, Chico, Concord, and a longer list — turn up in the directory's records linked to 650 numbers. None are inside the 650 footprint. The pattern reflects California's high number mobility and the routine ways records flow across regions through porting, prior registration, and public-record cross-linkage. The directory documents 504 distinct prefixes within 650 in detail, which represents our working coverage; the live prefix total is larger.

The most striking demographic feature of Daly City and the surrounding Peninsula is the housing market. Median home values run more than three times the US figure, among the highest readings outside San Francisco itself. Household income comes in substantially above the national reading, the median age skews a few years older than the country, and the city's population is modest in absolute terms but functions as part of the densely linked Peninsula corridor.