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. The route intersects KY 79 at that route's southern terminus. 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.

This section has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages) This section needs expansion. You can help by adding to it. (June 2016) This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. (June 2016) (Learn how and when to remove this message) (Learn how and when to remove this message)

The entire route was the original alignment of US 431 until 2002, when the U.S. Highway was rerouted to a four-lane alignment that KY 3519 closely follows.

The entire route is in Logan County.

Location	mi	km	Destinations	Notes
Russellville	0.000	0.000	US 68 Bus.	Southern terminus
	0.118	0.190	KY 2146
	0.194	0.312	KY 79 north (Fourth Street) – Morgantown	Southern terminus of KY 79
	1.501	2.416	US 68 (Russellville Bypass) / KY 80 to US 431 – Lewisburg, Hopkinsville, Auburn, Bowling Green
Epleys Station	3.309	5.325	KY 1040 north	Southern terminus of KY-1040
​	7.166	11.533	US 431 – Russellville, Lewisburg, Central City	Northern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

• US 431 at Kentucky Roads