Round Mountain is a town in Blanco County, Texas, United States.

[4] Round Mountain is located in northern Blanco County along U.S. Route 281.

According to the United States Census Bureau, the town of Round Mountain has a total area of 2.3 square miles (6.0 km2), all land.

[5] The climate in this area is characterized by hot, humid summers and generally mild to cool winters.

[6] As of the 2020 United States census, there were 101 people, 57 households, and 31 families residing in the town.