Is Hamilton County, TN in a flood zone?
FEMA's National Risk Index puts Hamilton County's flood hazard at the 94.9th percentile nationally — well above 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 1.9 times a year. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Hamilton County's flood-insurance compliance gap
Homes with a federally backed mortgage inside Hamilton County's mapped high-risk flood zone (the Special Flood Hazard Area, or SFHA) are legally required to carry an NFIP flood policy. In practice, 22.4% of them do — 849 active policies against 3,789 structures FEMA counts in that zone, leaving a real compliance gap. Across all residential structures in Hamilton County, not just the ones FEMA mandates, 1% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Hamilton County against the rest of the country
Hamilton County sits at rank 173 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 198 of 3144 by population (1 is biggest). Hamilton County, Tennessee is home to about 386,256 people across 542.165 square miles of land.
What to do next if you own or are buying in Hamilton County
FEMA counts 128,907 residential structures in Hamilton County overall, 1,269 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Hamilton County's numbers. The guide to what the Special Flood Hazard Area actually means explains why the mandatory-insurance rule exists and who it applies to.