Area Code 707

California

Area code 707 serves California, primarily Santa Rosa, in the Pacific Time (PT) time zone. It has served the region since 01-Jan-1959.

Overlay Area Code

This area code is part of an overlay region, meaning the same geographic area is served by multiple area codes. Overlay codes were introduced to meet growing demand for phone numbers without requiring existing customers to change their numbers.

This area code shares its geographic region with: area code 369 (Santa Rosa).

In service since: 01-Jan-1959

Learn more about overlay and split area codes →

Demographics & Economics

Demographic Data Unavailable for Area Code 707

County-level demographic data is not available for this area code because NPA boundary polygons are not publicly distributed by NANPA. We use geographic boundary data from the Colorado Open Data Portal to map area codes to counties, which currently covers 194 of 376 geographic area codes.

Demographic statistics (population, income, education, poverty) require county-level aggregations from Census ACS data. Without a county mapping, these aggregations cannot be computed. We are actively seeking additional data sources to improve coverage.

Statistics are population-weighted aggregations from Census ACS 5-year estimates where county boundary data is available.See Sources for details.

Time Zone

Pacific Time (PT)

NANPA Relief Status

According to the latest NANPA analysis (July 2026), this area code is not currently listed as exhausting within the next 36 months. No relief planning is in progress for this NPA.

Source: NANPA NPA Relief Planning Reports · See all relief planning statuses

Current Time

Pacific Time (PT)

Prefix Utilization

Geographic Coverage

State

Major Cities

Santa Rosa
Vallejo
Fairfield
Vacaville
Napa
Petaluma
Rohnert Park
Benicia
Eureka
Windsor
American Canyon
Dixon
Arcata
McKinleyville
Clearlake
Ukiah
Fortuna
Healdsburg
Sonoma
Rio Vista
Cloverdale
Larkfield-Wikiup
University of California-Davis
Cotati

and 123 more cities

Area Code 707 geographic coverage map (light mode)

History

Area code 707 was established in 1959 as a geographic area code. It shares its territory with area code area code 369.

Demographics

Detailed demographic and economic data is not yet available for area code 707.

County Coverage

Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 707).

County	Population	Share
Sonoma, CA	501,019	31.2%
Solano, CA	471,260	29.3%
Napa, CA	230,024	14.3%
Humboldt, CA	132,015	8.2%
Mendocino, CA	106,209	6.6%
Lake, CA	69,642	4.3%
Marin, CA	33,878	2.1%
Del Norte, CA	27,240	1.7%
Yolo, CA	22,971	1.4%
Sacramento, CA	10,973	0.7%
Trinity, CA	1,627	0.1%

Area Code 707 Family Tree

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Total Codes

Splits

Overlays

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All Descendants

Code ▲	State	Type	In Service	Parent
369	CA	overlay	01-Feb-2023	707

Area code 707 was originally assigned in 01-Jan-1959 to serve CA. Over the years, it has generated 1 descendant area code through a combination of geographic splits and overlays as demand for telephone numbers grew.