Shelby County, TN: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Shelby County scores at the 98.7th percentile for flood hazard, rated "Relatively High" — well above the national norm for flood hazard. The hazard here is driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 5.2 times a year. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Shelby County's flood-insurance compliance gap
Homes with a federally backed mortgage inside Shelby 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, 17.9% of them do — 543 active policies against 3,036 structures FEMA counts in that zone, leaving a real compliance gap. Looking beyond the mandated zone, 0.7% of all residential structures in Shelby County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
How Shelby County compares nationally
Among the 3144 US counties FEMA scores for flood hazard, Shelby County ranks 48 — 1 being the highest hazard nationally — and 65 by population among all 3144 counties covered here, where 1 is the largest. Shelby County, Tennessee is home to about 910,530 people across 752.775 square miles of land.
Your street may differ from Shelby County's average
1,978 of Shelby County's 303,314 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
Where Shelby County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. If you're unsure why any of this insurance requirement exists at all, the SFHA explainer covers it from first principles.