Union City is a borough in Erie County, Pennsylvania, United States 22 miles (35 km) southeast of Erie. In the twentieth century, there were three large chair factories, planing and grist mills, a powdered milk plant, and several furniture factories. The population was 3,320 at the 2010 census. It is part of the Erie Metropolitan Statistical Area.
The Union City Historic District was listed on the National Register of Historic Places in 1990.
Union City is in southeastern Erie County at 41°53′46″N 79°50′40″W (41.896056, -79.844425). It is surrounded by Union Township.
U.S. Route 6 and Pennsylvania Route 8 pass through the center of town as Main Street. US 6 heads east out of town on High Street, leading 11 miles (18 km) to Corry, and in the other direction turns southwest off Main Street onto Meadville Road, leading 30 miles (48 km) to Meadville. PA 8 leads north 8 miles (13 km) to Wattsburg and 27 miles (43 km) by an indirect route to Erie; to the south PA 8 leads 22 miles (35 km) to Titusville. Pennsylvania Route 97 heads west out of town as Waterford Street, leading 8 miles (13 km) to Waterford.