Linn County, KS: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Linn County scores at the 22.9th 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 1.7 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 Linn County
4.9% of the homes FEMA requires to carry flood insurance in Linn County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 8 policies against 163 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Looking beyond the mandated zone, 0.2% of all residential structures in Linn County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
How Linn County compares nationally
Among the 3144 US counties FEMA scores for flood hazard, Linn County ranks 2465 — 1 being the highest hazard nationally — and 2422 by population among all 3144 counties covered here, where 1 is the largest. Linn County, Kansas covers 594.081 square miles and counts roughly 9,841 residents.
What to do next if you own or are buying in Linn County
Across all of Linn County's 6,646 residential structures, 13 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
Where Linn 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.