Rohnert Park is a city in Sonoma County, California, United States, located approximately 50 mi north of San Francisco. The population at the 2010 United States Census was 40,971. It is an early planned city and is the sister city of Hashimoto in Japan. Sonoma State University, part of the California State University system, is located nearby.
The college that is part of California State University is located in Hashimoto. 