How much flood risk does Rock County actually carry?
Rock County lands at the 1.1th 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 5 years. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Mandatory flood insurance compliance in Rock County
Rock 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 Rock 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 Rock County ranks
Rock County sits at rank 3114 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 3096 of 3144 by population (1 is biggest). Rock County, Nebraska is home to about 1,241 people across 1,008.291 square miles of land.
What to do next if you own or are buying in Rock County
FEMA counts 1,578 residential structures in Rock 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 Rock County's numbers. See the data quality guide for why Rock County, like hundreds of other counties, doesn't get a clean compliance percentage.