How much flood risk does Greene County actually carry?
Greene County lands at the 63.5th percentile of FEMA's National Risk Index for flooding, "Relatively Low" territory — below the national norm for flood hazard — with the hazard driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 1.3 times a year. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Mandatory flood insurance compliance in Greene County
12.9% of the homes FEMA requires to carry flood insurance in Greene County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 37 policies against 288 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Across all residential structures in Greene County, not just the ones FEMA mandates, 0.2% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
How Greene County compares nationally
Greene County sits at rank 1197 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 763 of 3144 by population (1 is biggest). About 73,398 people live in Greene County, Tennessee, spread over 622.169 square miles.
What to do next if you own or are buying in Greene County
FEMA counts 33,259 residential structures in Greene County overall, 76 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 Greene 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.