Geary County (county code GE) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 34,362. Its county seat and most populous city is Junction City. The county is named in honor of Governor John W. Geary.Geary County comprises the Junction City, KS Micropolitan Statistical Area, which is included in the Manhattan-Junction City, KS Combined Statistical Area.