St. Tammany Parish, LA: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, St. Tammany Parish scores at the 94.2th percentile for flood hazard, rated "Relatively High" — well above the national norm for flood hazard. The hazard here is driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 2.3 times a year. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Mandatory flood insurance compliance in St. Tammany Parish
FEMA hasn't published a residential structure count for St. Tammany Parish's mapped flood zone, so a reliable mandatory-compliance percentage can't be computed here — see the data quality guide for why this gap exists for roughly a quarter of US counties. Looking beyond the mandated zone, 40.5% of all residential structures in St. Tammany Parish carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
St. Tammany Parish against the rest of the country
Among the 3144 US counties FEMA scores for flood hazard, St. Tammany Parish ranks 198 — 1 being the highest hazard nationally — and 264 by population among all 3144 counties covered here, where 1 is the largest. About 277,615 people live in St. Tammany Parish, Louisiana, spread over 845.308 square miles.
Your street may differ from St. Tammany Parish's average
FEMA counts 92,439 residential structures in St. Tammany Parish overall, 37,387 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
Where St. Tammany Parish's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. St. Tammany Parish's compliance figure is one of the ones affected by FEMA's incomplete denominator data — the data quality guide explains what that means and how many counties it touches.