Rio Vista is a city located in the eastern end of Solano County, California, in the Sacramento River Delta region of Northern California. The pop…Rio Vista is a city located in the eastern end of Solano County, California, in the Sacramento River Delta region of Northern California. The population was 7,360 at the 2010 census. Rio Vista is a small city in Solano County approximately 50 miles south of Sacramento, on the Sacramento River in the Sacramento River Delta.
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