Rio is a cdp located in Stanislaus County, in the state of California (CA), United States. Nestled in the Pacific division of the West region, it covers an area of 1.5 square miles (4.0 km²) and sits at an elevation of 125 ft. With a population of approximately 1,168 residents, Rio offers a peaceful, rural atmosphere.
The town's population is composed of about 48.8% males and 51.2% females, and it has a population density of 800.00 people per square mile (308.88/km²). Rio lies at a latitude of 37.75 and a longitude of -121.01, operating in the UTC-8.
Locals reflect a blend of American ancestry, with roots primarily in United States (0%), followed by English (27.8%), German (21.7%), and Scotch-Irish (0%) heritage. The town is identified by the ZIP code 95356.