628 Area Code: San Francisco, California

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Area Code 628 Information

State: California
Primary City: San Francisco
Primary Carrier: T-Mobile
Other Cities: Anaheim, Bakersfield, Chico

Neighborhood Demographics

Based on US Census data for San Francisco

39.7 y/o

Median Age

Compared to the US median age of 38.7 y/o

$141.4K

Median Income

Compared to the US median income of $78.5K

$1.4M

Median Home Value

Compared to the US median home value of $303.4K

836.3K

San Francisco Population

Compared to the US median city population of 171.9K

Active Prefixes in the 628 Area Code

About the 628 Area Code

The 628 code is an overlay assigned to the same San Francisco region long served by the 415, layered on as number demand pushed past what a single code could support. San Francisco anchors the directory's records here, on the tip of the peninsula at the entrance to one of the largest natural harbors on the Pacific coast. The city's neighborhood structure, dense low-rise housing stock, and concentrated downtown core make 415-and-628 numbers among the most heavily concentrated by population of any US area-code footprint.

Records associated with 628 numbers often include other California city names — Anaheim, Bakersfield, Chico, Concord, and others among them. None of those are inside 628's footprint. The recurrence reflects California's high inter-city number mobility, with porting, prior registration, and address linkage routinely surfacing cross-city patterns in records like these. Because 628 is a relatively young overlay, the directory's prefix-level holdings remain modest at this stage — 18 distinct prefixes documented in detail — and that figure represents an early-stage subset rather than the prefix total that will eventually populate the code.

San Francisco's home values dominate the demographic story: typical valuations run more than four times the US median, among the highest readings of any major American city. Median household income sits comfortably above the national figure, the city's population is in the mid–800,000 range, and median age is close to the US reading.