How much flood risk does Marshall County actually carry?
Marshall County lands at the 38.8th percentile of FEMA's National Risk Index for flooding, "Relatively Low" territory — below the national norm for flood hazard — with the hazard 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. 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 Marshall County
Marshall 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 Marshall 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.
Marshall County against the rest of the country
Marshall County sits at rank 1987 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2029 of 3144 by population (1 is biggest). About 16,147 people live in Marshall County, Oklahoma, spread over 371.49 square miles.
Checking a specific address in Marshall County
7 of Marshall County's 9,138 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 Marshall County's numbers. See the data quality guide for why Marshall County, like hundreds of other counties, doesn't get a clean compliance percentage.