Randolph County, IL: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Randolph County scores at the 57.8th percentile for flood hazard, rated "Relatively Low" — below the national norm for flood hazard. The hazard here is driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 1 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.
Randolph County's flood-insurance compliance gap
30.8% of the homes FEMA requires to carry flood insurance in Randolph County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 111 policies against 360 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Looking beyond the mandated zone, 1.2% of all residential structures in Randolph County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Randolph County ranks
Among the 3144 US counties FEMA scores for flood hazard, Randolph County ranks 1390 — 1 being the highest hazard nationally — and 1446 by population among all 3144 counties covered here, where 1 is the largest. Randolph County, Illinois covers 575.367 square miles and counts roughly 29,903 residents.
What to do next if you own or are buying in Randolph County
130 of Randolph County's 10,573 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
Where Randolph County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. If you're unsure why any of this insurance requirement exists at all, the SFHA explainer covers it from first principles.