Is Dewey County, OK in a flood zone?
FEMA's National Risk Index puts Dewey County's flood hazard at the 5.7th percentile nationally — 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 3 years. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Mandatory flood insurance compliance in Dewey County
Dewey County is one of the counties where FEMA's own denominator for mandated flood-zone structures is missing, so no compliance rate is shown rather than a guessed one — the data quality guide covers how common this is. Across all residential structures in Dewey County, not just the ones FEMA mandates, 0% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Dewey County against the rest of the country
Dewey County sits at rank 2973 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2868 of 3144 by population (1 is biggest). Dewey County, Oklahoma covers 999.628 square miles and counts roughly 4,268 residents.
Checking a specific address in Dewey County
Across all of Dewey County's 2,536 residential structures, 0 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Dewey County's numbers. See the data quality guide for why Dewey County, like hundreds of other counties, doesn't get a clean compliance percentage.