Is Richland County, IL in a flood zone?
FEMA's National Risk Index puts Richland County's flood hazard at the 41.3th percentile nationally — 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 1.2 times a year. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Richland County's flood-insurance compliance gap
Richland 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 Richland 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.
Where Richland County ranks
Richland County sits at rank 1904 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2069 of 3144 by population (1 is biggest). Richland County, Illinois is home to about 15,362 people across 360.047 square miles of land.
What to do next if you own or are buying in Richland County
Across all of Richland County's 7,654 residential structures, 6 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 Richland County's numbers. See the data quality guide for why Richland County, like hundreds of other counties, doesn't get a clean compliance percentage.