Is Ottawa County, OK in a flood zone?
FEMA's National Risk Index puts Ottawa County's flood hazard at the 78.2th percentile nationally — a middling flood hazard by national standards — driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 4.4 times a year. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Ottawa County's flood-insurance compliance gap
Homes with a federally backed mortgage inside Ottawa County's mapped high-risk flood zone (the Special Flood Hazard Area, or SFHA) are legally required to carry an NFIP flood policy. In practice, 13.2% of them do — 180 active policies against 1,361 structures FEMA counts in that zone, leaving a real compliance gap. Across all residential structures in Ottawa County, not just the ones FEMA mandates, 1.5% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
How Ottawa County compares nationally
Ottawa County sits at rank 716 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 1433 of 3144 by population (1 is biggest). Ottawa County, Oklahoma covers 470.817 square miles and counts roughly 30,404 residents.
What to do next if you own or are buying in Ottawa County
189 of Ottawa County's 13,019 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Ottawa County's numbers. The guide to what the Special Flood Hazard Area actually means explains why the mandatory-insurance rule exists and who it applies to.