How much flood risk does Greene County actually carry?
Greene County lands at the 12th percentile of FEMA's National Risk Index for flooding, "Very Low" territory — among the lowest flood hazard in the country — with the hazard driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 1.9 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
0% of the homes FEMA requires to carry flood insurance in Greene County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 0 policies against 22 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Across all residential structures in Greene County, not just the ones FEMA mandates, 0% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Greene County against the rest of the country
Greene County sits at rank 2788 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2518 of 3144 by population (1 is biggest). Greene County, Iowa is home to about 8,662 people across 569.558 square miles of land.
What to do next if you own or are buying in Greene County
FEMA counts 4,956 residential structures in Greene County overall, 2 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 Greene 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.