Is Grant County, OK in a flood zone?
FEMA's National Risk Index puts Grant County's flood hazard at the 13.8th 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 1.1 times a year. 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 Grant County
Grant 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 Grant County, not just the ones FEMA mandates, 0.1% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Grant County ranks
Grant County sits at rank 2740 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2872 of 3144 by population (1 is biggest). Grant County, Oklahoma covers 1,000.74 square miles and counts roughly 4,123 residents.
Your street may differ from Grant County's average
FEMA counts 2,601 residential structures in Grant County overall, 3 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Grant County's numbers. See the data quality guide for why Grant County, like hundreds of other counties, doesn't get a clean compliance percentage.