Union County Illinois has 8 places on the National Register of Historic Places including 2 places of National significance. Significant places include Stinson Memorial Library and Ware Mounds and Village Site, St. Anne's Episcopal Church, St. Paulus Evangelisch Lutherischen Gemeinde and Union Lookout.
Prehistoric cultural affiliation(s) include Late Woodland and Mississippi dating back to 500.
The famous person Charles M. Willard is associated with one of more of the Union County historic places.
Some of the country's most noteable architects helped create the Union County places including Walter Burley Griffin, Charles Theodore Fettinger, James Dickenson and Conrad Fischer. Prominent architectural styles found in Union Country are Queen Anne, Classical Revival and Federal.
