To ensure a continuing supply of telephone numbers, the California Public Utilities Commission has approved an all-services overlay for the 707 area code region. The 707 area code serves all or portions of Del Norte, Glenn, Humboldt, Lake, Marin, Mendocino, Napa, Solano, Sonoma, Tehama and Trinity counties, and encompasses cities such as American Canyon, Arcata, Benicia, Calistoga, Clearlake, Cloverdale, Cotati, Crescent City, Dixon, Eureka, Fairfield, Ferndale, Fort Bragg, Healdsburg, Lakeport, Napa, Petaluma, Point Arena, Rio Dell, Rio Vista, Rohnert Park, Saint Helena, Santa Rosa, Sebastopol, Sonoma, Suisun City, Trinidad, Ukiah, Vacaville, Vallejo, Windsor, Willits, and Yountville. The new 369 area code will serve the same geographic area currently served by the 707 area code.
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