Is LaSalle Parish, LA in a flood zone?
FEMA's National Risk Index puts LaSalle Parish's flood hazard at the 23.4th percentile nationally — among the lowest flood hazard in the country — driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about once every 1 years. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Who actually carries the flood insurance FEMA requires
LaSalle Parish is one of the counties where FEMA's own denominator for mandated flood-zone structures is missing, so no compliance rate is shown rather than a guessed one — the data quality guide covers how common this is. Across all residential structures in LaSalle Parish, not just the ones FEMA mandates, 1.4% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where LaSalle Parish ranks
LaSalle Parish sits at rank 2448 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2109 of 3144 by population (1 is biggest). LaSalle Parish, Louisiana is home to about 14,702 people across 624.854 square miles of land.
Checking a specific address in LaSalle Parish
Across all of LaSalle Parish's 4,981 residential structures, 69 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed LaSalle Parish's numbers. See the data quality guide for why LaSalle Parish, like hundreds of other counties, doesn't get a clean compliance percentage.