Blair County, PA flood risk explained
Flood hazard in Blair County sits at the 87.5th national percentile, 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 1.5 times a year. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Mandatory flood insurance compliance in Blair County
19.1% of the homes FEMA requires to carry flood insurance in Blair County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 451 policies against 2,366 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Looking beyond the mandated zone, 1.1% of all residential structures in Blair County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
How Blair County compares nationally
Among the 3144 US counties FEMA scores for flood hazard, Blair County ranks 410 — 1 being the highest hazard nationally — and 535 by population among all 3144 counties covered here, where 1 is the largest. Blair County, Pennsylvania covers 525.067 square miles and counts roughly 120,269 residents.
Your street may differ from Blair County's average
500 of Blair County's 46,516 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
Where Blair County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. If you're unsure why any of this insurance requirement exists at all, the SFHA explainer covers it from first principles.