The 1st Supervisorial District is bounded on the north by Porter Creek and Franz Valley School Roads, to the east by the Napa county line, to the west by a combination of roads, including Mark West Springs Road, Fountaingrove Parkway Brookwood Ave, Farmers Lane and Petaluma Hill Road, and to the south by San Pablo Bay.
Population is concentrated in the City of Santa Rosa (Bennett Valley, Rincon Valley & the community of Oakmont), the City of Sonoma and the adjacent unincorporated communities of Kenwood, Agua Caliente, Glen Ellen, El Verano, Boyes Hot Springs, Schellville & Vineburg.
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