Is Collier County, FL in a flood zone?
FEMA's National Risk Index puts Collier County's flood hazard at the 98.3th percentile nationally — among the highest flood hazard in the country — split between inland river flooding (about 1 times a year) and coastal storm surge (about 3.3 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.
Who actually carries the flood insurance FEMA requires
The raw NFIP numbers for Collier County would imply over 100% of mandated homes carry a policy, which just means FEMA's structure-count denominator for this county is wrong, not that compliance is unusually good. This is flagged rather than clipped to look normal — details in the data quality guide. Across all residential structures in Collier County, not just the ones FEMA mandates, 29.6% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Collier County against the rest of the country
Collier County sits at rank 62 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 183 of 3144 by population (1 is biggest). Collier County, Florida covers 1,997.014 square miles and counts roughly 416,233 residents.
What to do next if you own or are buying in Collier County
FEMA counts 174,174 residential structures in Collier County overall, 51,467 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 Collier County's numbers. See the data quality guide for why Collier County, like hundreds of other counties, doesn't get a clean compliance percentage.