- SonomaCountyCarMart.com provides the Sonoma County community with a full service website which offers local used car shoppers the ability to search for used cars, trucks, vans and sport utility vehicles (SUVs) for sale by Sonoma County residents and Sonoma County used car dealers. SonomaCountyCarMart.com also offers the Sonoma County residents and independent used car dealers with a full service ...www.sonomacountycarmart.com