Elliston is a census-designated place (CDP) in Powell County, Montana, United States.

The town is most likely named after Northern Pacific Railroad director John W.

[3] According to the United States Census Bureau, the CDP has a total area of 8.8 square miles (23 km2), all land.

The racial makeup of the CDP was 98.22% White, 0.89% Native American, 0.44% Asian, and 0.44% from two or more races.

About 7.6% of families and 10.4% of the population were below the poverty line, including 13.0% of those under the age of eighteen and 6.5% of those 65 or over.