Hamilton County, NY: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Hamilton County scores at the 41.8th percentile for flood hazard, rated "Relatively Low" — below the national norm for flood hazard. 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 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.
Hamilton County's flood-insurance compliance gap
FEMA hasn't published a residential structure count for Hamilton 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, 0.8% of all residential structures in Hamilton County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Hamilton County ranks
Among the 3144 US counties FEMA scores for flood hazard, Hamilton County ranks 1892 — 1 being the highest hazard nationally — and 2813 by population among all 3144 counties covered here, where 1 is the largest. Hamilton County, New York covers 1,717.378 square miles and counts roughly 5,082 residents.
Checking a specific address in Hamilton County
FEMA counts 6,874 residential structures in Hamilton County overall, 57 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
Where Hamilton County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Hamilton 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.