How much flood risk does Douglas County actually carry?
Douglas County lands at the 60.1th percentile of FEMA's National Risk Index for flooding, "Relatively Low" territory — below the national norm for flood hazard — with the hazard 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. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Douglas County's flood-insurance compliance gap
Homes with a federally backed mortgage inside Douglas County's mapped high-risk flood zone (the Special Flood Hazard Area, or SFHA) are legally required to carry an NFIP flood policy. In practice, 12.7% of them do — 84 active policies against 660 structures FEMA counts in that zone, leaving a real compliance gap. Across all residential structures in Douglas County, not just the ones FEMA mandates, 1.2% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Douglas County against the rest of the country
Douglas County sits at rank 1313 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 1838 of 3144 by population (1 is biggest). About 19,824 people live in Douglas County, Illinois, spread over 416.65 square miles.
Your street may differ from Douglas County's average
FEMA counts 7,795 residential structures in Douglas County overall, 95 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Douglas 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.