Ellis County, OK flood risk explained
Flood hazard in Ellis County sits at the 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 4 years. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Mandatory flood insurance compliance in Ellis County
FEMA hasn't published a residential structure count for Ellis 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 Ellis County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Ellis County ranks
Among the 3144 US counties FEMA scores for flood hazard, Ellis County ranks 2935 — 1 being the highest hazard nationally — and 2916 by population among all 3144 counties covered here, where 1 is the largest. Ellis County, Oklahoma is home to about 3,601 people across 1,231.477 square miles of land.
What to do next if you own or are buying in Ellis County
Across all of Ellis County's 2,690 residential structures, 0 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
Where Ellis County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Ellis 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.