Clinton County, IA: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Clinton County scores at the 66.9th 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 2.5 times a year. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Mandatory flood insurance compliance in Clinton County
Out of 823 homes FEMA counts inside Clinton County's mapped flood zone, 82 carry the flood policy federal law requires there — 10% compliance, short of full coverage. Looking beyond the mandated zone, 0.5% of all residential structures in Clinton County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Clinton County against the rest of the country
Among the 3144 US counties FEMA scores for flood hazard, Clinton County ranks 1088 — 1 being the highest hazard nationally — and 1070 by population among all 3144 counties covered here, where 1 is the largest. About 46,015 people live in Clinton County, Iowa, spread over 694.959 square miles.
Checking a specific address in Clinton County
FEMA counts 21,730 residential structures in Clinton County overall, 108 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
Where Clinton 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.