Yuba County is located in the U.S. state of California's Central Valley, north of Sacramento, along the Feather River. As of 2006 its population was 71,938. The county seat is Marysville. Yuba County was one of the original counties of California, formed in 1850 and named after the Yuba River by Captain John Sutter for the Native American village Yubu.
The county has a total area of 644 mi², 98% of it is land and 2% of it is water. The median income for a household in the county was $30,460, and the median income for a family was $34,103.