K-42 is a 75.061-mile-long (120.799 km) east–west state highway in the U.S. state of Kansas. It's western terminus is at U.S. Route 281 (US-281) in Sawyer and the eastern terminus is at Interstate 235 (I-235) in Wichita. Along the way K-42 intersects K-14, a major north–south highway, in Rago and K-2 east of Norwich. The highway is a two-lane highway for most of its length with the exception of the section within Wichita, which is a four-lane divided highway.