Johnson County, TX: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Johnson County scores at the 80.9th percentile for flood hazard, rated "Relatively Moderate" — a middling flood hazard by national standards. 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 2.5 times a year. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Johnson County's flood-insurance compliance gap
Out of 1,456 homes FEMA counts inside Johnson County's mapped flood zone, 350 carry the flood policy federal law requires there — 24% compliance, short of full coverage. Looking beyond the mandated zone, 0.8% 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 627 — 1 being the highest hazard nationally — and 338 by population among all 3144 counties covered here, where 1 is the largest. Johnson County, Texas covers 725.062 square miles and counts roughly 210,547 residents.
Your street may differ from Johnson County's average
Across all of Johnson County's 63,145 residential structures, 510 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
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.