Perkins County, SD: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Perkins County scores at the 4.7th percentile for flood hazard, rated "Very Low" — among the lowest flood hazard in the country. The hazard here is driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about once every 1 years. 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 Perkins County
FEMA hasn't published a residential structure count for Perkins County's mapped flood zone, so a reliable mandatory-compliance percentage can't be computed here — see the data quality guide for why this gap exists for roughly a quarter of US counties. Looking beyond the mandated zone, 0% of all residential structures in Perkins County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Perkins County against the rest of the country
Among the 3144 US counties FEMA scores for flood hazard, Perkins County ranks 3002 — 1 being the highest hazard nationally — and 2967 by population among all 3144 counties covered here, where 1 is the largest. Perkins County, South Dakota covers 2,870.46 square miles and counts roughly 2,832 residents.
Checking a specific address in Perkins County
Across all of Perkins County's 3,282 residential structures, 0 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
Where Perkins County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Perkins County's compliance figure is one of the ones affected by FEMA's incomplete denominator data — the data quality guide explains what that means and how many counties it touches.