Ohlman is a village in Montgomery County, Illinois, United States. As of the 2020 census, the village had a population of 109,[3] down from 135 in 2010.
Ohlman is in northeastern Montgomery County and is bordered to the north by Christian County. Illinois Route 16 passes through the village, leading southwest 4.5 miles (7.2 km) to Nokomis and northeast 8 miles (13 km) to Pana. Hillsboro, the Montgomery county seat, is 21 miles (34 km) to the southwest via IL 16.
According to the U.S. Census Bureau, Ohlman has a total area of 0.32 square miles (0.83 km2), all land.<"CenPopGazetteer2022"/> The village drains northwest toward the South Fork of the Sangamon River, a tributary of the Illinois River.