Cannelton is a city in Troy Township, Perry County, Indiana, United States, along the Ohio River. The population was 1,209 at the 2000 census. Cannelton, which is the smallest incorporated city in the state, was formerly the county seat of Perry County until the seat was relocated to Tell City. The name Cannelton was adopted in 1844 is derived from the cannel coal that was once mined in the area.

Cannelton is located at 37°54′36″N 86°44′24″W / 37.91°N 86.74°W / 37.91; -86.74 (37.910134, -86.739931).

According to the 2010 census, the city has a total area of 1.58 square miles (4.1 km²), of which 1.48 square miles (3.8 km²) (or 93.67%) is land and 0.10 square miles (0.26 km²) (or 6.33%) is water.

As of the census of 2000, there were 1,209 people, 509 households, and 297 families residing in the city. The population density was 816.0 people per square mile (315.4/km²). There were 577 housing units at an average density of 389.4 per square mile (150.5/km²). The racial makeup of the city was 98.01% White, 0.08% African American, 0.33% Native American, 0.08% Asian, 0.50% from other races, and 0.99% from two or more races. Hispanic or Latino of any race were 0.58% of the population.