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About Keokuk Geodes. Keokuk Geodes. Keokuk, Iowa is situated at the confluence of the Mississippi and Des Moines Rivers in the extreme southeastern portion of the state of Iowa. Illinois borders Iowa on the east and Missouri is to the south (area known locally as the Tri-State area). See map below for a visual view:
Microfilm from the State Historical Society of Iowa without notes, but with maps from the first set of original official plats (originally at the Surveyor General's office in Dubuque, then transferred to the Secretary of State's office, now at the SHSI library).