Supervisor Dave Rosenberg Dave Rosenberg was elected Yolo County Supervisor, District Four, in 1996. District Four is a large district, encompassing 61, 638 acres. It's also a diverse district ranging from County Road 27 to the north, the Yolo ByPass near West Sacramento to the east, down to the Solano County Line in the south and Highway 113 to the west. Included within the district is most of ...