Unionville is a small hamlet in Pershing County, Nevada, located south of I-80 and just east of State Route 400 on Unionville Road, with the most recent population estimate being approximately 20 people. The town's best years were during the 1870s, when it was an active mining and prospecting town serving the surrounding hilly region. For a brief time, Samuel Langhorne Clemens lived there and prospected, but left without having had much success. Currently, the hamlet consists of a single business - a tourist inn - and a few small houses clustered along or near the gravel roadway which permits vehicular ingress and egress. The nearest paved road, an extension of this gravel road, is about 7 miles to the east.