Shelby County, IA: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Shelby County scores at the 19.5th 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 7 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 Shelby County
11.8% of the homes FEMA requires to carry flood insurance in Shelby County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 14 policies against 119 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Looking beyond the mandated zone, 0.3% of all residential structures in Shelby County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Shelby County ranks
Among the 3144 US counties FEMA scores for flood hazard, Shelby County ranks 2573 — 1 being the highest hazard nationally — and 2293 by population among all 3144 counties covered here, where 1 is the largest. About 11,821 people live in Shelby County, Iowa, spread over 590.776 square miles.
Checking a specific address in Shelby County
19 of Shelby County's 5,889 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
Where Shelby County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. If you're unsure why any of this insurance requirement exists at all, the SFHA explainer covers it from first principles.