to
Update
is a city in Johnson County, Texas, United States. The population was 656 at the 2000 census. The local Rio Vista residents dispute the proper way to pronounce the name of the town. Either "RYE-o Vista", or "REE-o Vista".
According to the United States Census Bureau, the city has a total area of 0.8 square miles (2.0 km²), all of it land.