Sonoma County has nine incorporated cities, including the Town of Windsor. In order of population, they are: Santa Rosa (156,200), Petaluma (56,727), Rohnert Park (42,236), Windsor (22,744), Healdsburg (10,722), Sonoma (9,128), Sebastopol (7,774), Cloverdale (7,636), and Cotati (6,471). Unincorporated Communities A-C Unicorporated Communities D-G Unincorporated Communities H-N Unincorporated Communities O-Z Agua