K-126 begins at an intersection with
US-400 and heads northward; south of this intersection, the roadway continues as Northwest 100th Street. The highway passes the small city of
McCune on its eastern limit, then meanders slightly to the northwest before turning north again. It continues in this direction for about and then curves due east. Afterward, K-126 crosses Lightning Creek and continues east through mostly open farmlands and pastures toward
Pittsburg. Approximately east of Lightning Creek, the route intersects
K-7, then crosses the
BNSF Railway. K-126 continues east past the railway through flat, open plains. It then enters a lightly wooded area scattered with several small ponds and crosses Second Cow Creek en route to Pittsburg. Just inside the city limits of Pittsburg, K-126 crosses First Cow Creek. East of the creek is a four-lane highway that carries the
US-69 and
US-160 designations. K-126 intersects this road, then continues eastward into the city; the route is known as 4th Street inside the city limits. It serves a residential area in the western section of the city, then passes a library and enters the downtown section. Here, it meets
U.S. Route 69 Business (Broadway Street), then continues farther east. K-126 is not included in the
National Highway System. The National Highway System is a system of highways important to the nation's defense, economy, and mobility. K-126 does connect to the National Highway System at its junction with US-69 and US-160. All but of K-126's alignment is maintained by KDOT. The entire section within Pittsburg is maintained by the city. == History ==