Atchison County Official Website

Atchison County is a county located in the northeast portion of the U.S. state of Kansas. Its county seat and most populous city is Atchison. As of the 2020 census, the county population was 16,348. The county was named in honor of David Atchison, a U.S. Senator from Missouri and border ruffian during the "Bleeding Kansas" era.

Cities in Atchison County:

• Atchison (county seat)
• Effingham
• Huron
• Lancaster
• Muscotah