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Welcome to the Chillicothe Area Chamber of Commerce website. Address: 514 Washington Street, Post Office Box 407, Chillicothe, Missouri 64601. 660-646-4050, office@chillicothemo.com Chillicothe is located in the heart of Northwest Missouri at the junction of Highway 65 and Highway 36. Chillicothe is proud to be the Home of Sliced Bread.