Is Allegany County, NY in a flood zone?
FEMA's National Risk Index puts Allegany County's flood hazard at the 84.6th percentile nationally — a middling flood hazard by national standards — driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 1.6 times a year. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Allegany County's flood-insurance compliance gap
Allegany County 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 Allegany 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.
How Allegany County compares nationally
Allegany County sits at rank 506 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 1045 of 3144 by population (1 is biggest). Allegany County, New York is home to about 47,299 people across 1,029.507 square miles of land.
What to do next if you own or are buying in Allegany County
205 of Allegany County's 23,085 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Allegany County's numbers. See the data quality guide for why Allegany County, like hundreds of other counties, doesn't get a clean compliance percentage.