Is Logan County, IL in a flood zone?
FEMA's National Risk Index puts Logan County's flood hazard at the 53.7th percentile nationally — below the national norm for flood hazard — driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 1.6 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.
Mandatory flood insurance compliance in Logan County
Out of 240 homes FEMA counts inside Logan County's mapped flood zone, 37 carry the flood policy federal law requires there — 15.4% compliance, short of full coverage. Across all residential structures in Logan County, not just the ones FEMA mandates, 0.4% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Logan County ranks
Logan County sits at rank 1518 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 1525 of 3144 by population (1 is biggest). Logan County, Illinois is home to about 27,518 people across 618.052 square miles of land.
Checking a specific address in Logan County
41 of Logan County's 11,758 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 Logan 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.