Duncan, Mercer County, Kentucky
# Duncan, Mercer County, Kentucky

Duncan is an unincorporated community in Mercer County, Kentucky, United States. Duncan is located at the junction of Kentucky Route 390 and Kentucky Route 1941, 10 miles (16 km) northwest of Harrodsburg.

A post office was established in the community in 1842, and it was probably named for prominent citizen John Ray Duncan.

