St. John the Baptist Parish, LA flood risk explained
Flood hazard in St. John the Baptist Parish sits at the 75.4th national percentile, a middling flood hazard by national standards; driven by coastal storm surge rather than inland rivers — FEMA's model puts a surge event here at about 3.8 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.
St. John the Baptist Parish's flood-insurance compliance gap
79.8% of the homes FEMA requires to carry flood insurance in St. John the Baptist Parish — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 2,989 policies against 3,747 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Looking beyond the mandated zone, 34.2% of all residential structures in St. John the Baptist Parish carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
St. John the Baptist Parish against the rest of the country
Among the 3144 US counties FEMA scores for flood hazard, St. John the Baptist Parish ranks 809 — 1 being the highest hazard nationally — and 1195 by population among all 3144 counties covered here, where 1 is the largest. About 39,694 people live in St. John the Baptist Parish, Louisiana, spread over 214.474 square miles.
Checking a specific address in St. John the Baptist Parish
FEMA counts 15,943 residential structures in St. John the Baptist Parish overall, 5,448 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
Where St. John the Baptist Parish's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. St. John the Baptist Parish's coastal exposure is covered in the coastal vs. inland flood risk guide, including how storm surge risk differs from river flooding.