How much flood risk does Spencer County actually carry?
Spencer County lands at the 22.6th 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. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Who actually carries the flood insurance FEMA requires
Homes with a federally backed mortgage inside Spencer 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, 22.4% of them do — 17 active policies against 76 structures FEMA counts in that zone, leaving a real compliance gap. Across all residential structures in Spencer County, not just the ones FEMA mandates, 0.5% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
How Spencer County compares nationally
Spencer County sits at rank 2474 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 1777 of 3144 by population (1 is biggest). Spencer County, Kentucky covers 186.671 square miles and counts roughly 20,823 residents.
Your street may differ from Spencer County's average
27 of Spencer County's 5,734 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 Spencer 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.