How much flood risk does Jasper County actually carry?
Jasper County lands at the 28.4th 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 1.5 times a year. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Mandatory flood insurance compliance in Jasper County
Jasper 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 Jasper County, not just the ones FEMA mandates, 0.1% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Jasper County against the rest of the country
Jasper County sits at rank 2302 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2486 of 3144 by population (1 is biggest). Jasper County, Illinois is home to about 9,092 people across 494.614 square miles of land.
What to do next if you own or are buying in Jasper County
Across all of Jasper County's 5,884 residential structures, 4 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Jasper County's numbers. See the data quality guide for why Jasper County, like hundreds of other counties, doesn't get a clean compliance percentage.