How much flood risk does Anderson County actually carry?
Anderson County lands at the 77.7th percentile of FEMA's National Risk Index for flooding, "Relatively Moderate" territory — a middling flood hazard by national standards — with the hazard driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 1.1 times a year. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Who actually carries the flood insurance FEMA requires
15.6% of the homes FEMA requires to carry flood insurance in Anderson County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 43 policies against 276 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Across all residential structures in Anderson 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.
Anderson County against the rest of the country
Anderson County sits at rank 731 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 715 of 3144 by population (1 is biggest). Anderson County, Tennessee is home to about 81,449 people across 337.206 square miles of land.
Your street may differ from Anderson County's average
98 of Anderson County's 31,242 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Anderson 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.