K-19 is a 34-mile (55 km) Kansas state highway that runs north–south for one leg and east–west for its second leg. The first leg begins at US-50 in Belpre. At the Arkansas River south of Larned, K-19 turns east, bypassing both Radium and Seward to the south before ending at US-281.

K-19 has two spurs — Spur K-19, which crosses the Arkansas River, ending about a mile later at US-56 in Larned; and K-219, a one-mile (1.6 km) spur to Seward

K-19 appears on the 1932 state highway map. Kansas Department of Transportation: Historic State Maps