Winneshiek County, IA: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Winneshiek County scores at the 47.5th percentile for flood hazard, rated "Relatively Low" — below the national norm for flood hazard. 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 1.5 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.
Who actually carries the flood insurance FEMA requires
FEMA hasn't published a residential structure count for Winneshiek 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, 0.6% of all residential structures in Winneshiek County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
How Winneshiek County compares nationally
Among the 3144 US counties FEMA scores for flood hazard, Winneshiek County ranks 1711 — 1 being the highest hazard nationally — and 1843 by population among all 3144 counties covered here, where 1 is the largest. Winneshiek County, Iowa covers 689.844 square miles and counts roughly 19,723 residents.
Your street may differ from Winneshiek County's average
60 of Winneshiek County's 10,076 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
Where Winneshiek County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Winneshiek 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.