Middleburg is a rural unincorporated community with a post office sitting just off the Green River in central Casey County, Kentucky, United States.

Riffe built a home there and operated a mill, which began the focal point of the community.

He was also the community's first postmaster when the post office first opened on February 11, 1837.

He named it possibly for Middleburg, Virginia; or because of its location midway between Liberty and Hustonville.

This Casey County, Kentucky state location article is a stub.