How much flood risk does Montgomery County actually carry?
Montgomery County lands at the 98.2th 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 5.7 times a year. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Montgomery County's flood-insurance compliance gap
Out of 2,407 homes FEMA counts inside Montgomery County's mapped flood zone, 1,130 carry the flood policy federal law requires there — 47% compliance, short of full coverage. Across all residential structures in Montgomery 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.
Where Montgomery County ranks
Montgomery County sits at rank 63 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 70 of 3144 by population (1 is biggest). About 879,190 people live in Montgomery County, Pennsylvania, spread over 482.937 square miles.
Checking a specific address in Montgomery County
FEMA counts 262,652 residential structures in Montgomery County overall, 2,284 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 Montgomery 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.