Yuba County is a county in the U.S. state of California.As of the 2010 Census, the population was 72,155. The county seat is Marysville.. Yuba County is included in the Yuba City, California Metropolitan Statistical Area, which is also included in the Sacramento-Roseville, California Combined Statistical Area.

Yuba City is a city in Northern California and the county seat of Sutter County, California, United States.The population was 64,925 at the 2010 census. Yuba City is the principal city of the Yuba City Metropolitan Statistical Area which encompasses all of Sutter County and Yuba County.