Is Iroquois County, IL in a flood zone?
FEMA's National Risk Index puts Iroquois County's flood hazard at the 79.6th 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 1.4 times a year. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Who actually carries the flood insurance FEMA requires
16.7% of the homes FEMA requires to carry flood insurance in Iroquois County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 237 policies against 1,417 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Across all residential structures in Iroquois County, not just the ones FEMA mandates, 2% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Iroquois County against the rest of the country
Iroquois County sits at rank 671 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 1578 of 3144 by population (1 is biggest). Iroquois County, Illinois covers 1,117.408 square miles and counts roughly 26,067 residents.
What to do next if you own or are buying in Iroquois County
255 of Iroquois County's 12,586 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Iroquois 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.