Is Hanson County, SD in a flood zone?
FEMA's National Risk Index puts Hanson County's flood hazard at the 15th percentile nationally — among the lowest flood hazard in the country — driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 2.2 times a year. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Mandatory flood insurance compliance in Hanson County
Out of 32 homes FEMA counts inside Hanson County's mapped flood zone, 2 carry the flood policy federal law requires there — 6.3% compliance, short of full coverage. Across all residential structures in Hanson 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.
Hanson County against the rest of the country
Hanson County sits at rank 2705 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2924 of 3144 by population (1 is biggest). About 3,477 people live in Hanson County, South Dakota, spread over 434.582 square miles.
Checking a specific address in Hanson County
FEMA counts 2,117 residential structures in Hanson County overall, 5 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 Hanson 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.