Is Teton County, WY in a flood zone?
FEMA's National Risk Index puts Teton County's flood hazard at the 34.7th 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 3 years. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Who actually carries the flood insurance FEMA requires
Out of 248 homes FEMA counts inside Teton County's mapped flood zone, 53 carry the flood policy federal law requires there — 21.4% compliance, short of full coverage. Across all residential structures in Teton County, not just the ones FEMA mandates, 3% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Teton County ranks
Teton County sits at rank 2114 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 1675 of 3144 by population (1 is biggest). Teton County, Wyoming covers 3,996.846 square miles and counts roughly 23,272 residents.
What to do next if you own or are buying in Teton County
Across all of Teton County's 11,509 residential structures, 341 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 Teton 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.