How much flood risk does Lehigh County actually carry?
Lehigh County lands at the 95.4th percentile of FEMA's National Risk Index for flooding, "Relatively High" territory — well above the national norm for flood hazard — with the hazard driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 3.2 times a year. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Lehigh County's flood-insurance compliance gap
Out of 1,167 homes FEMA counts inside Lehigh County's mapped flood zone, 268 carry the flood policy federal law requires there — 23% compliance, short of full coverage. Across all residential structures in Lehigh County, not just the ones FEMA mandates, 0.4% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Lehigh County ranks
Lehigh County sits at rank 158 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 199 of 3144 by population (1 is biggest). Lehigh County, Pennsylvania is home to about 385,655 people across 345.336 square miles of land.
What to do next if you own or are buying in Lehigh County
FEMA counts 115,473 residential structures in Lehigh County overall, 423 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 Lehigh 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.