Green County, WI: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Green County scores at the 44.4th 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 1.7 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
Out of 230 homes FEMA counts inside Green County's mapped flood zone, 33 carry the flood policy federal law requires there — 14.4% compliance, short of full coverage. Looking beyond the mandated zone, 0.3% of all residential structures in Green County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
How Green County compares nationally
Among the 3144 US counties FEMA scores for flood hazard, Green County ranks 1808 — 1 being the highest hazard nationally — and 1256 by population among all 3144 counties covered here, where 1 is the largest. Green County, Wisconsin is home to about 37,183 people across 584.044 square miles of land.
Checking a specific address in Green County
39 of Green County's 13,428 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
Where Green 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.