Duncans Mills, CA

ZIP code 95430 serves Duncans Mills, a small, unincorporated community in western Sonoma County near the Russian River. Its most notable landmark is the Duncans Mills Historic District, a preserved 19th-century settlement with historic buildings and a former railway depot. The river and surrounding wooded hills shape the area’s rural character; the historic village also features local shops and Stumptown Brewery.