How much flood risk does McPherson County actually carry?
McPherson County lands at the 8th 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 2 years. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
McPherson County's flood-insurance compliance gap
McPherson County is one of the counties where FEMA's own denominator for mandated flood-zone structures is missing, so no compliance rate is shown rather than a guessed one — the data quality guide covers how common this is. Across all residential structures in McPherson County, not just the ones FEMA mandates, 0% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
McPherson County against the rest of the country
McPherson County sits at rank 2908 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 3019 of 3144 by population (1 is biggest). McPherson County, South Dakota covers 1,136.668 square miles and counts roughly 2,307 residents.
Your street may differ from McPherson County's average
FEMA counts 1,205 residential structures in McPherson County overall, 0 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 McPherson County's numbers. See the data quality guide for why McPherson County, like hundreds of other counties, doesn't get a clean compliance percentage.