How much flood risk does Glynn County actually carry?
Glynn County lands at the 89.6th percentile of FEMA's National Risk Index for flooding, "Relatively High" territory — well above the national norm for flood hazard — with the hazard driven by coastal storm surge rather than inland rivers — FEMA's model puts a surge event here at about 3.6 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 Glynn County
Homes with a federally backed mortgage inside Glynn County's mapped high-risk flood zone (the Special Flood Hazard Area, or SFHA) are legally required to carry an NFIP flood policy. In practice, 90.5% of them do — 5,137 active policies against 5,676 structures FEMA counts in that zone, one of the higher compliance rates FEMA reports. Across all residential structures in Glynn County, not just the ones FEMA mandates, 31.1% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Glynn County ranks
Glynn County sits at rank 343 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 683 of 3144 by population (1 is biggest). About 86,540 people live in Glynn County, Georgia, spread over 419.622 square miles.
Your street may differ from Glynn County's average
FEMA counts 32,222 residential structures in Glynn County overall, 10,032 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 Glynn County's numbers. Because storm surge plays a real role here, the guide to coastal vs. inland flood hazard is worth reading alongside this page.