How much flood risk does Brown County actually carry?
Brown County lands at the 17.7th percentile of FEMA's National Risk Index for flooding, "Very Low" territory — among the lowest flood hazard in the country — 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 1 years. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Who actually carries the flood insurance FEMA requires
Brown 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 Brown 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.
Brown County against the rest of the country
Brown County sits at rank 2623 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2481 of 3144 by population (1 is biggest). Brown County, Kansas covers 570.871 square miles and counts roughly 9,142 residents.
Checking a specific address in Brown County
FEMA counts 5,495 residential structures in Brown County overall, 1 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 Brown County's numbers. See the data quality guide for why Brown County, like hundreds of other counties, doesn't get a clean compliance percentage.