Delaware County, OK flood risk explained
Flood hazard in Delaware County sits at the 86.5th national percentile, 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 1.4 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 Delaware County
Homes with a federally backed mortgage inside Delaware 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, 8.9% of them do — 73 active policies against 821 structures FEMA counts in that zone, leaving a real compliance gap. Looking beyond the mandated zone, 0.4% of all residential structures in Delaware County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Delaware County ranks
Among the 3144 US counties FEMA scores for flood hazard, Delaware County ranks 448 — 1 being the highest hazard nationally — and 1161 by population among all 3144 counties covered here, where 1 is the largest. Delaware County, Oklahoma covers 737.751 square miles and counts roughly 41,771 residents.
Checking a specific address in Delaware County
FEMA counts 23,025 residential structures in Delaware County overall, 85 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
Where Delaware County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. If you're unsure why any of this insurance requirement exists at all, the SFHA explainer covers it from first principles.