New Lebanon is a village in Montgomery County, Ohio, United States. The population was 3,995 at the 2010 census. It is part of the Dayton Metropolitan Statistical Area.
New Lebanon was platted in 1843. A post office called Medill was established in 1847, and the name was changed to New Lebanon in 1849. New Lebanon was incorporated as a village in 1878.
New Lebanon is located at 39°44′45″N 84°23′37″W (39.745729, -84.393494).
According to the United States Census Bureau, the village has a total area of 2.05 square miles (5.31 km2), all land.
As of the census of 2010, there were 3,995 people, 1,527 households, and 1,057 families living in the village. The population density was 1,948.8 inhabitants per square mile (752.4/km2). There were 1,659 housing units at an average density of 809.3 per square mile (312.5/km2). The racial makeup of the village was 96.2% White, 1.2% African American, 0.1% Native American, 0.4% Asian, 0.1% from other races, and 2.0% from two or more races. Hispanic or Latino of any race were 0.7% of the population.