Oliver County, ND: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Oliver County scores at the 6.5th percentile for flood hazard, rated "Very Low" — among the lowest flood hazard in the country. 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 once every 3 years. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Oliver County's flood-insurance compliance gap
FEMA hasn't published a residential structure count for Oliver 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, 0.6% of all residential structures in Oliver County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
How Oliver County compares nationally
Among the 3144 US counties FEMA scores for flood hazard, Oliver County ranks 2952 — 1 being the highest hazard nationally — and 3047 by population among all 3144 counties covered here, where 1 is the largest. About 1,882 people live in Oliver County, North Dakota, spread over 722.404 square miles.
What to do next if you own or are buying in Oliver County
Across all of Oliver County's 837 residential structures, 5 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
Where Oliver County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Oliver 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.