Willis is an unincorporated community in Knox County, Indiana, in the United States.[1]
The first post office in Willis was called Willis Grove.[2] Established in 1879, the post office was renamed Willis in 1894, and was discontinued in 1907.[3]
A post office called Willis Grove was established...
38°33′12″N 87°21′26″W / 38.55333°N 87.35722°W / 38.55333; -87.35722