K-181 (Kansas highway)

K-181 is a 70.2-mile-long (113.0 km) north–south state highway which runs through several counties in the north central part of the U.S. state of Kansas. K-181's southern terminus is at K-232 southeast of Lucas by Wilson Lake Dam, and the northern terminus is at U.S. Highway 36 (US-36) and US-281 south of Lebanon. Along the way the highway intersects US-24 and K-9 in Downs.

Before state highways were numbered in Kansas, the section of K-181 from the Solomon River north to Downs was part of the Roosevelt National Highway and Kansas White Way auto trails. A short section from Sylvan Grove southward was part of the Sunflower Trail. When K-181 was first designated on January 7, 1937, it extended from US-24 northward to US-36 and US-281. Then between 1948 and 1972, it was gradually extended southward to its current alignment.