Oak Hill is a city in Clay County, Kansas, United States.

[4] A post office was opened in 1871 in Oak Hill (also historically spelled Oakhill), and remained in operation until it was discontinued in 1995.

[5] In 1887, Atchison, Topeka and Santa Fe Railway built a branch line from Neva (three miles west of Strong City) through Oak Hill to Superior, Nebraska.

According to the United States Census Bureau, the city has a total area of 0.05 square miles (0.13 km2), all land.

There were no families and 2.9% of the population living below the poverty line, including no under eighteens and none of those over 64.

The community is served by Clay County USD 379 public school district.