Unionville is an unincorporated community and census-designated place in East Marlborough Township in southern Chester County, Pennsylvania, United States.

It was originally known as Jacksonville.

[2] The Unionville Village Historic District was added to the National Register of Historic Places in 1979.

[4] Unionville is located in the Unionville-Chadds Ford School District.

Unionville High School is a member of the Ches-mont league since 2007, in PIAA District 1.