Is Columbiana County, OH in a flood zone?
FEMA's National Risk Index puts Columbiana County's flood hazard at the 82.2th percentile nationally — a middling flood hazard by national standards — driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 1.9 times a year. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Columbiana County's flood-insurance compliance gap
Out of 483 homes FEMA counts inside Columbiana County's mapped flood zone, 73 carry the flood policy federal law requires there — 15.1% compliance, short of full coverage. Across all residential structures in Columbiana County, not just the ones FEMA mandates, 0.2% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Columbiana County ranks
Columbiana County sits at rank 585 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 623 of 3144 by population (1 is biggest). Columbiana County, Ohio is home to about 99,823 people across 531.93 square miles of land.
Checking a specific address in Columbiana County
Across all of Columbiana County's 43,770 residential structures, 90 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 Columbiana 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.