Rio Vista is a city in Johnson County, Texas, United States. The population was 1,008 in 2020.
Rio Vista is located in southern Johnson County. Texas State Highway 174 passes through the west side of the city, leading north to Cleburne, the county seat, and southwest to Meridian.
According to the United States Census Bureau, Rio Vista has a total area of , of which , or 0.29%, are water. The city's area drains to the Nolan River, a tributary of the Brazos River.
As of the 2020 census, Rio Vista had a population of 1,008, a median age of 32.8 years, 28.2% of residents under the age of 18, and 12.1% of residents aged 65 years or older. For every 100 females there were 101.6 males, and for every 100 females age 18 and over there were 97.3 males age 18 and over.
0.0% of residents lived in urban areas, while 100.0% lived in rural areas.
There were 345 households in Rio Vista, of which 47.0% had children under the age of 18 living in them. Of all households, 52.2% were married-couple households, 15.4% were households with a male householder and no spouse or partner present, and 24.6% were households with a female householder and no spouse or partner present. About 17.7% of all households were made up of individuals and 10.5% had someone living alone who was 65 years of age or older.
There were 374 housing units, of which 7.8% were vacant. The homeowner vacancy rate was 3.7% and the rental vacancy rate was 3.2%.
The city is served by the Rio Vista Independent School District.