Sunman is a town in Adams Township, Ripley County, in the U.S. state of Indiana. The population was 1,049 at the 2010 census.
A post office has been in operation at Sunman since 1833. John Sunman, an early postmaster, gave the place his name. Sunman had its start as a town in 1856 when the railroad was extended to that point.
Sunman is located at 39°14′11″N 85°5′38″W (39.236324, -85.093768).
According to the 2010 census, Sunman has a total area of 1.17 square miles (3.03 km2), all land.
The climate in this area is characterized by hot, humid summers and generally mild to cool winters. According to the Köppen Climate Classification system, Sunman has a humid subtropical climate, abbreviated "Cfa" on climate maps.
As of the census of 2010, there were 1,049 people, 371 households, and 272 families living in the town. The population density was 896.6 inhabitants per square mile (346.2/km2). There were 413 housing units at an average density of 353.0 per square mile (136.3/km2). The racial makeup of the town was 95.1% White, 0.6% African American, 0.2% Asian, 2.7% from other races, and 1.4% from two or more races. Hispanic or Latino of any race were 7.9% of the population.