How much flood risk does Dillon County actually carry?
Dillon County lands at the 61.5th 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 6 years. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Mandatory flood insurance compliance in Dillon County
25.3% of the homes FEMA requires to carry flood insurance in Dillon County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 37 policies against 146 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Across all residential structures in Dillon County, not just the ones FEMA mandates, 0.8% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Dillon County against the rest of the country
Dillon County sits at rank 1265 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 1521 of 3144 by population (1 is biggest). Dillon County, South Carolina is home to about 27,577 people across 405.076 square miles of land.
Your street may differ from Dillon County's average
Across all of Dillon County's 11,995 residential structures, 91 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Dillon 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.