Area code 707, Telephone prefix in Northern California, US
Area code 707 is a telephone prefix in Northern California that reaches from the Pacific shoreline to inland valleys. It covers eleven counties, including Napa, Sonoma, Marin, and portions of Humboldt.
The California Public Utilities Commission introduced this prefix in 1959 when the original 415 code was divided. It served northern regions that needed separation from the San Francisco metropolitan calling area.
The telephone area serves major wine production regions, agricultural communities, and coastal settlements across eleven different California counties.
When calling into this region, you dial either the 707 prefix or the newer overlay code 369, which began assignment in February 2023. Both codes operate within the same geographic footprint and require full ten-digit dialing at all times.
This prefix links wine country with coastal towns and redwood forests across more than 150 miles (240 km). A single telephone code thus spans landscapes from the Pacific Ocean to inland mountain ranges.
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