How much flood risk does Clinton County actually carry?
Clinton County lands at the 44.7th 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 1.7 times a year. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Mandatory flood insurance compliance in Clinton County
Out of 318 homes FEMA counts inside Clinton County's mapped flood zone, 52 carry the flood policy federal law requires there — 16.4% compliance, short of full coverage. Across all residential structures in Clinton County, not just the ones FEMA mandates, 0.4% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Clinton County ranks
Clinton County sits at rank 1799 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 1154 of 3144 by population (1 is biggest). About 42,019 people live in Clinton County, Ohio, spread over 408.731 square miles.
Your street may differ from Clinton County's average
Across all of Clinton County's 15,623 residential structures, 68 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Clinton 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.