Lemoyne is an unincorporated community and census-designated place in northern Keith County, Nebraska, United States. It lies along Nebraska Highway 92 on the northern shore of Lake C.W. McConaughy, north of the city of Ogallala, the county seat of Keith County. Its elevation is 3,333 feet (1,016 m). Although Lemoyne is unincorporated, it has a post office, with the ZIP code of 69146.