Is Jackson County, IL in a flood zone?
FEMA's National Risk Index puts Jackson County's flood hazard at the 76.5th percentile nationally — a middling flood hazard by national standards — driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 6.1 times a year. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Mandatory flood insurance compliance in Jackson County
Out of 857 homes FEMA counts inside Jackson County's mapped flood zone, 84 carry the flood policy federal law requires there — 9.8% compliance, short of full coverage. Across all residential structures in Jackson County, not just the ones FEMA mandates, 0.6% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Jackson County against the rest of the country
Jackson County sits at rank 774 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 973 of 3144 by population (1 is biggest). Jackson County, Illinois is home to about 53,199 people across 583.574 square miles of land.
Your street may differ from Jackson County's average
Across all of Jackson County's 19,735 residential structures, 112 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Jackson County's numbers. The guide to what the Special Flood Hazard Area actually means explains why the mandatory-insurance rule exists and who it applies to.