How much flood risk does Jefferson County actually carry?
Jefferson County lands at the 24.3th 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 9 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 Jefferson County
Homes with a federally backed mortgage inside Jefferson 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, 17.7% of them do — 11 active policies against 62 structures FEMA counts in that zone, leaving a real compliance gap. Across all residential structures in Jefferson County, not just the ones FEMA mandates, 0.2% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Jefferson County ranks
Jefferson County sits at rank 2422 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2096 of 3144 by population (1 is biggest). Jefferson County, Georgia covers 526.555 square miles and counts roughly 15,019 residents.
Your street may differ from Jefferson County's average
16 of Jefferson County's 7,961 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 Jefferson 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.