Atchison County, MO flood risk explained
Flood hazard in Atchison County sits at the 25.6th 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 1.5 times a year. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Who actually carries the flood insurance FEMA requires
FEMA hasn't published a residential structure count for Atchison 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, 0.2% of all residential structures in Atchison County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
How Atchison County compares nationally
Among the 3144 US counties FEMA scores for flood hazard, Atchison County ranks 2386 — 1 being the highest hazard nationally — and 2809 by population among all 3144 counties covered here, where 1 is the largest. Atchison County, Missouri covers 547.285 square miles and counts roughly 5,139 residents.
Your street may differ from Atchison County's average
Across all of Atchison County's 3,688 residential structures, 7 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
Where Atchison County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Atchison 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.