How much flood risk does Lexington County actually carry?
Lexington County lands at the 90.6th percentile of FEMA's National Risk Index for flooding, "Relatively Moderate" territory — a middling flood hazard by national standards — with the hazard 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. 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
Out of 1,395 homes FEMA counts inside Lexington County's mapped flood zone, 933 carry the flood policy federal law requires there — 66.9% compliance, short of full coverage. Across all residential structures in Lexington County, not just the ones FEMA mandates, 1.2% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Lexington County ranks
Lexington County sits at rank 312 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 236 of 3144 by population (1 is biggest). Lexington County, South Carolina covers 698.548 square miles and counts roughly 313,774 residents.
Checking a specific address in Lexington County
1,311 of Lexington County's 114,085 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 Lexington 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.