Logan County is a county located in the U.S. state of Kansas. Its county seat and largest city is Oakley. As of the 2020 census, the county population was 2,762. The county was named for John Logan, a general during the American Civil War. One of the county's distinctive features is a mile-long stretch of Smoky Hill Chalk bluffs that tower 100 feet high over the Smoky Hill River and are dubbed "Little Jerusalem" for resemblance to the ancient walled city.