Mount Orab is a village in Brown County, Ohio, United States. The population was 3,664 at the 2010 census.
Mount Orab was laid out in 1850. The village's name most likely is derived from Mount Horeb, a place in the Hebrew Bible.
Mount Orab is located at 39°1′47″N 83°55′30″W (39.029613, -83.924918).
According to the United States Census Bureau, the village has a total area of 8.89 square miles (23.02 km2), all land.
As of the census of 2010, there were 3,664 people, 1,381 households, and 1,013 families living in the village. The population density was 412.1 inhabitants per square mile (159.1/km2). There were 1,473 housing units at an average density of 165.7 per square mile (64.0/km2). The racial makeup of the village was 97.7% White, 0.7% African American, 0.1% Native American, 0.6% Asian, 0.2% from other races, and 0.7% from two or more races. Hispanic or Latino of any race were 0.6% of the population.
There were 1,381 households, of which 41.2% had children under the age of 18 living with them, 50.8% were married couples living together, 17.2% had a female householder with no husband present, 5.4% had a male householder with no wife present, and 26.6% were non-families. 22.8% of all households were made up of individuals, and 8.6% had someone living alone who was 65 years of age or older.