How much flood risk does Gibson County actually carry?
Gibson County lands at the 52.9th 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 1.6 times a year. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Mandatory flood insurance compliance in Gibson County
Out of 535 homes FEMA counts inside Gibson County's mapped flood zone, 73 carry the flood policy federal law requires there — 13.6% compliance, short of full coverage. Across all residential structures in Gibson County, not just the ones FEMA mandates, 0.5% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
How Gibson County compares nationally
Gibson County sits at rank 1541 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 988 of 3144 by population (1 is biggest). About 51,422 people live in Gibson County, Tennessee, spread over 602.745 square miles.
What to do next if you own or are buying in Gibson County
FEMA counts 21,113 residential structures in Gibson County overall, 114 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 Gibson 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.