Rockville is a town in Washington County, Utah, United States.

It is located along the Virgin River near the mouth of Zion Canyon.

According to the United States Census Bureau, the town has a total area of 8.4 square miles (21.8 km2), all land.

39.1% of all households were made up of individuals, and 12.2% had someone living alone who was 65 years of age or older.

About 10.1% of families and 10.4% of the population were below the poverty line, including 18.2% of those under the age of eighteen and 7.4% of those 65 or over.