How much flood risk does Lancaster County actually carry?
Lancaster County lands at the 85.5th 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 1.4 times a year. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Who actually carries the flood insurance FEMA requires
24.8% of the homes FEMA requires to carry flood insurance in Lancaster County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 639 policies against 2,580 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Across all residential structures in Lancaster County, not just the ones FEMA mandates, 0.8% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Lancaster County against the rest of the country
Lancaster County sits at rank 478 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 223 of 3144 by population (1 is biggest). Lancaster County, Nebraska is home to about 332,857 people across 837.56 square miles of land.
Checking a specific address in Lancaster County
FEMA counts 97,303 residential structures in Lancaster County overall, 753 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Lancaster 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.