How much flood risk does DeKalb County actually carry?
DeKalb County lands at the 81.7th 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 1.7 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 DeKalb County
Out of 510 homes FEMA counts inside DeKalb County's mapped flood zone, 37 carry the flood policy federal law requires there — 7.3% compliance, short of full coverage. Across all residential structures in DeKalb County, not just the ones FEMA mandates, 0.2% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
How DeKalb County compares nationally
DeKalb County sits at rank 601 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 765 of 3144 by population (1 is biggest). DeKalb County, Alabama is home to about 73,122 people across 777.077 square miles of land.
Your street may differ from DeKalb County's average
FEMA counts 32,260 residential structures in DeKalb County overall, 51 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 DeKalb 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.