Greene County, OH: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Greene County scores at the 75.4th percentile for flood hazard, rated "Relatively Moderate" — a middling flood hazard by national standards. 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 2.1 times a year. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Who actually carries the flood insurance FEMA requires
Out of 689 homes FEMA counts inside Greene County's mapped flood zone, 184 carry the flood policy federal law requires there — 26.7% compliance, short of full coverage. Looking beyond the mandated zone, 0.7% of all residential structures in Greene County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Greene County against the rest of the country
Among the 3144 US counties FEMA scores for flood hazard, Greene County ranks 807 — 1 being the highest hazard nationally — and 404 by population among all 3144 counties covered here, where 1 is the largest. Greene County, Ohio covers 413.632 square miles and counts roughly 172,347 residents.
Checking a specific address in Greene County
FEMA counts 56,131 residential structures in Greene County overall, 383 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
Where Greene 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.