How much flood risk does Clark County actually carry?
Clark County lands at the 84.2th percentile of FEMA's National Risk Index for flooding, "Relatively Moderate" territory — a middling flood hazard by national standards — with the hazard 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.
Mandatory flood insurance compliance in Clark County
22.3% of the homes FEMA requires to carry flood insurance in Clark County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 214 policies against 960 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Across all residential structures in Clark County, not just the ones FEMA mandates, 0.5% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Clark County against the rest of the country
Clark County sits at rank 520 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 489 of 3144 by population (1 is biggest). Clark County, Ohio covers 395.879 square miles and counts roughly 134,985 residents.
Your street may differ from Clark County's average
Across all of Clark County's 51,285 residential structures, 275 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 Clark 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.