Is St. Clair County, AL in a flood zone?
FEMA's National Risk Index puts St. Clair County's flood hazard at the 75.9th percentile nationally — a middling flood hazard by national standards — driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 1 times a year. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
St. Clair County's flood-insurance compliance gap
38.8% of the homes FEMA requires to carry flood insurance in St. Clair County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 253 policies against 652 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Across all residential structures in St. Clair County, not just the ones FEMA mandates, 0.9% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
St. Clair County against the rest of the country
St. Clair County sits at rank 791 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 640 of 3144 by population (1 is biggest). About 96,927 people live in St. Clair County, Alabama, spread over 631.61 square miles.
Checking a specific address in St. Clair County
FEMA counts 33,512 residential structures in St. Clair County overall, 301 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 St. Clair 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.