How much flood risk does Allen County actually carry?
Allen County lands at the 26.3th percentile of FEMA's National Risk Index for flooding, "Very Low" territory — among the lowest flood hazard in the country — 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.
Allen County's flood-insurance compliance gap
13.8% of the homes FEMA requires to carry flood insurance in Allen County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 46 policies against 333 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Across all residential structures in Allen County, not just the ones FEMA mandates, 0.9% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Allen County ranks
Allen County sits at rank 2365 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2257 of 3144 by population (1 is biggest). About 12,425 people live in Allen County, Kansas, spread over 500.298 square miles.
What to do next if you own or are buying in Allen County
Across all of Allen County's 5,954 residential structures, 53 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 Allen 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.