What is the most populous city in the county that includes LeLoup, Kansas?
LeLoup, Kansas LeLoup is an unincorporated community in Franklin County, Kansas, United States.
Jefferson County, Kansas Jefferson County (county code JF) is a county located in the U.S. state of Kansas. At the 2010 census, the county population was 19,126. Its county seat is Oskaloosa, and its most populous city is Valley Falls.