Unionville was originally known as Fleenersburg, and under the latter name was platted in 1847.[3] The post office at Unionville has been in operation since 1848.[4]
In 1911, Unionville was the precise center of the United States population. A monument was dedicated there at that time.
Education
Unionville is home to an elementary school, Unionville Elementary School, which was once Unionville High School.