Campbell County, SD flood risk explained
Flood hazard in Campbell County sits at the 8.7th 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 once every 2 years. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Who actually carries the flood insurance FEMA requires
FEMA hasn't published a residential structure count for Campbell 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, 0.1% of all residential structures in Campbell County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Campbell County ranks
Among the 3144 US counties FEMA scores for flood hazard, Campbell County ranks 2887 — 1 being the highest hazard nationally — and 3088 by population among all 3144 counties covered here, where 1 is the largest. Campbell County, South Dakota covers 733.767 square miles and counts roughly 1,342 residents.
Your street may differ from Campbell County's average
1 of Campbell County's 2,042 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
Where Campbell County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Campbell 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.