How much flood risk does Johnson County actually carry?
Johnson County lands at the 9th 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 once every 3 years. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Johnson County's flood-insurance compliance gap
7.4% of the homes FEMA requires to carry flood insurance in Johnson County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 13 policies against 176 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Across all residential structures in Johnson 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.
How Johnson County compares nationally
Johnson County sits at rank 2878 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2803 of 3144 by population (1 is biggest). Johnson County, Nebraska is home to about 5,219 people across 376.086 square miles of land.
What to do next if you own or are buying in Johnson County
FEMA counts 3,534 residential structures in Johnson County overall, 16 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 Johnson 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.