The town is located along the Big Reedy Creek, a tributary of the Green River.

Because the community straddles the Butler–Edmonson County line, it is on the boundary of two school districts based in Morgantown and Brownsville, respectively.

Students west and/or south of the KY 70 and KY 185 junction attend Butler County Schools based in Morgantown, while students east and/or north of the junction attend Edmonson County Schools in the Brownsville area.

Roundhill is home to two businesses along the county line, one is an auto parts/repair shop and the other, a convenience store named "The Corner Market.

"[3] That business also serves as the community's USPS village post office with ZIP code 42275.