Category:1866 in Kansas
- States of the United States
- Alabama
- Arkansas
- California
- Connecticut
- Delaware
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Missouri
- Montana
- Nebraska
- New Hampshire
- New Jersey
- New York
- Ohio
- Oregon
- Pennsylvania
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- Wisconsin
- Wyoming
- District of Columbia
- Washington, D.C.
- Insular areas
