Is Hamilton County, KS in a flood zone?
FEMA's National Risk Index puts Hamilton County's flood hazard at the 1.4th percentile nationally — among the lowest flood hazard in the country — driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about once every 4 years. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Who actually carries the flood insurance FEMA requires
Hamilton 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 Hamilton County, not just the ones FEMA mandates, 0.3% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
How Hamilton County compares nationally
Hamilton County sits at rank 3104 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2995 of 3144 by population (1 is biggest). Hamilton County, Kansas is home to about 2,488 people across 996.514 square miles of land.
Checking a specific address in Hamilton County
Across all of Hamilton County's 1,055 residential structures, 3 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 Hamilton County's numbers. See the data quality guide for why Hamilton County, like hundreds of other counties, doesn't get a clean compliance percentage.