Jasper County, IA flood risk explained
Flood hazard in Jasper County sits at the 40.2th national percentile, below the national norm for flood hazard; driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 1.8 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 Jasper County
Out of 60 homes FEMA counts inside Jasper County's mapped flood zone, 8 carry the flood policy federal law requires there — 13.3% compliance, short of full coverage. Looking beyond the mandated zone, 0.2% of all residential structures in Jasper County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
How Jasper County compares nationally
Among the 3144 US counties FEMA scores for flood hazard, Jasper County ranks 1942 — 1 being the highest hazard nationally — and 1233 by population among all 3144 counties covered here, where 1 is the largest. About 38,107 people live in Jasper County, Iowa, spread over 730.428 square miles.
Checking a specific address in Jasper County
Across all of Jasper County's 15,844 residential structures, 24 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
Where Jasper 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.