Sullivan County, IN flood risk explained
Flood hazard in Sullivan County sits at the 23th national percentile, among the lowest flood hazard in the country; driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 3.6 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.
Sullivan County's flood-insurance compliance gap
FEMA hasn't published a residential structure count for Sullivan 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% of all residential structures in Sullivan County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Sullivan County ranks
Among the 3144 US counties FEMA scores for flood hazard, Sullivan County ranks 2461 — 1 being the highest hazard nationally — and 1782 by population among all 3144 counties covered here, where 1 is the largest. About 20,768 people live in Sullivan County, Indiana, spread over 447.196 square miles.
Your street may differ from Sullivan County's average
4 of Sullivan County's 9,402 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
Where Sullivan County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Sullivan 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.