State + disaster type
Flood history in Illinois
Illinois has 323 county-level flood declarations across 76 counties. Calhoun County leads with 11 declarations. Total tracked FEMA obligations for flood events in this state: $535.5M.
This page shows every Illinois county in Illinois that has at least one FEMA flood declaration on record, ranked by how many times that hazard type triggered federal aid. Counties near the top of this list have recurring exposure to flood events — useful context for anyone evaluating property risk, insurance needs, or emergency planning in the area.
For the full national view of flood declarations across all states, see the flood disaster type page. For all hazard types in Illinois, see the Illinois state page.
Flood in Illinois