It is part of the Bald Eagle Valley and the State College, Pennsylvania Metropolitan Statistical Area.

A Late Woodland village that was occupied between AD 1200 and 1600, now known as the Fisher Farm site, is located along Bald Eagle Creek on Unionville's western edge.

Unionville became the third borough incorporated in Centre County in 1859, and became a station along the Bald Eagle Valley Railroad in 1864.

[7] The district, which includes virtually all of Unionville, was added to the Register for its high quality of preservation since before World War I.

[8] According to the United States Census Bureau, the borough has a total area of 0.3 square miles (0.7 km2), all land.

[4] The Ridge Soaring Gliderport, which is just southwest of Unionville, is featured in a scene of the 1999 movie The Thomas Crown Affair.