Lyons is a town in Washington Township, Greene County, Indiana, United States. The population was 742 at the 2010 census. It is part of the Bloomfield, Indiana Metropolitan Statistical Area.
Lyons was named in honor of Squire Joe Lyons, a county official. The Lyons post office opened in 1870.
Lyons is located at 38°59′19″N 87°4′56″W (38.988685, -87.082211).
According to the 2010 census, Lyons has a total area of 0.87 square miles (2.25 km2), all land.
As of the census of 2010, there were 742 people, 270 households, and 175 families living in the town. The population density was 852.9 inhabitants per square mile (329.3/km2). There were 310 housing units at an average density of 356.3 per square mile (137.6/km2). The racial makeup of the town was 98.1% White, 0.1% African American, 0.5% Native American, 0.3% Asian, 0.1% from other races, and 0.8% from two or more races. Hispanic or Latino of any race were 1.5% of the population.
There were 270 households, of which 31.5% had children under the age of 18 living with them, 50.0% were married couples living together, 10.7% had a female householder with no husband present, 4.1% had a male householder with no wife present, and 35.2% were non-families.