Johnson County, GA: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Johnson County scores at the 11th percentile for flood hazard, rated "Very Low" — among the lowest flood hazard in the country. 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 once every 4 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 Johnson County
Homes with a federally backed mortgage inside Johnson 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, 6.3% of them do — 2 active policies against 32 structures FEMA counts in that zone, leaving a real compliance gap. Looking beyond the mandated zone, 0.1% of all residential structures in Johnson County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Johnson County ranks
Among the 3144 US counties FEMA scores for flood hazard, Johnson County ranks 2817 — 1 being the highest hazard nationally — and 2474 by population among all 3144 counties covered here, where 1 is the largest. About 9,178 people live in Johnson County, Georgia, spread over 303.019 square miles.
What to do next if you own or are buying in Johnson County
2 of Johnson County's 4,081 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
Where Johnson 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.