Kentucky Route 3519 (KY 3519) is a secondary highway located entirely in Logan County in south-central Kentucky.

The station begins at the junction with U.S. Route 68 Business (US 68 Bus.)

at the Public Square near the Logan County Courthouse.

It intersects the Russellville Bypass, the current main alignment of US 68 on the north side of town.

The route then goes north-northwest of town reaching the town of Epleys Station before ending at a junction with US 431 between Epleys Station and Lewisburg.