Sweetser is a town in Franklin, Pleasant and Richland townships, Grant County, Indiana, United States. The population was 1229 at the 2010 census.
Sweetser is located at 40°34′11″N 85°46′1″W (40.569731, -85.766972) on State Road 18 between the town of Converse and the city of Marion. According to the 2010 census, Sweetser has a total area of 1.013 square miles (2.62 km2), of which 1.01 square miles (2.62 km2) (or 99.7%) is land and 0.003 square miles (0.01 km2) (or 0.3%) is water.
Running through the edge of Sweetser is a small body of water, or creek, known as Pipe Creek. Pipe Creek is one of the sites that can be seen from the Sweetser Switch Trail. Known as one of Sweetser's main attractions, the trail is a walking trail that stretches throughout the whole town and is expanded three miles outside of the town's outer limits. Although this trail is intended for walking, there are signs posted that allow bicyclists, cross country skiers, runners, wheel chairs and various other ways of exercise permitted on the trail. A new addition to the trail is a statue of one of Grant County's celebrities, Garfield.
As of the census of 2010, there were 1,229 people, 494 households, and 364 families residing in the town. The population density was 1,216.8 inhabitants per square mile (469.8/km2).