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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.
The 2nd Supervisorial District includes all of the cities of Petaluma and Cotati and a portion of Rohnert Park, as well as the unincorporated communities of Penngrove, Two Rock, Bloomfield, and a portion of the unincorporated community south of Sebastopol.
The 3rd Supervisorial District is bounded on the north by Steele Lane, to the east primarily by Petaluma Hill Road, to the west by a combination of roads, including S. Wright Road, Llano Road, and Highway 101, and to the south by East Cotati Ave to Sonoma State University.
The 4th Supervisorial District includes northeast Fulton, the Larkfield-Wikiup area of Santa Rosa, the Town of Windsor, the City of Healdsburg, the community of Geyserville and the City of Cloverdale.
The 5th Supervisorial District encompasses the west county, including the entire Sonoma County coast, the lower Russian River area, Sebastopol, and portions of northwest and southwest Santa Rosa.