Richmond County, NY: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Richmond County scores at the 92th percentile for flood hazard, rated "Relatively Moderate" — a middling flood hazard by national standards. The hazard here is driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 1.9 times a year. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Mandatory flood insurance compliance in Richmond County
FEMA hasn't published a residential structure count for Richmond County's mapped flood zone, so a reliable mandatory-compliance percentage can't be computed here — see the data quality guide for why this gap exists for roughly a quarter of US counties. Looking beyond the mandated zone, 4.4% of all residential structures in Richmond County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
How Richmond County compares nationally
Among the 3144 US counties FEMA scores for flood hazard, Richmond County ranks 267 — 1 being the highest hazard nationally — and 149 by population among all 3144 counties covered here, where 1 is the largest. Richmond County, New York is home to about 498,212 people across 57.523 square miles of land.
Your street may differ from Richmond County's average
Across all of Richmond County's 119,930 residential structures, 5,301 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
Where Richmond County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Richmond County's compliance figure is one of the ones affected by FEMA's incomplete denominator data — the data quality guide explains what that means and how many counties it touches.