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County Information



Some of the cities, towns, and places in Jefferson County are Boyle, Buck Creek, Dunavant, Grantville, Half Mound, Lakeside Village, McLouth, Medina, Meriden, Mooney Creek, Newman, Nortonville, Oskaloosa, Ozawkie, Perry, Rock Creek, Thompsonville, Valley Falls, Williamstown, Winchester



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.