Fiatt is an unincorporated community in Fulton County, Illinois, United States. The community is on Illinois Routes 9 and 97 west of Canton. Fiatt has a post office with ZIP Code 61433, which opened on July 17, 1843.

It is served by the Cuba Community Unit District 3 school system (K–12) and Spoon River College. The community lies within the Canton micropolitan statistical area. It is in Joshua Township.

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