Franklin County, WA flood risk explained
Flood hazard in Franklin County sits at the 83.5th national percentile, a middling flood hazard by national standards; driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about once every 5 years. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Mandatory flood insurance compliance in Franklin County
FEMA hasn't published a residential structure count for Franklin County's mapped flood zone, so a reliable mandatory-compliance percentage can't be computed here — see the data quality guide for why this gap exists for roughly a quarter of US counties. Looking beyond the mandated zone, 0.1% of all residential structures in Franklin County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Franklin County ranks
Among the 3144 US counties FEMA scores for flood hazard, Franklin County ranks 543 — 1 being the highest hazard nationally — and 617 by population among all 3144 counties covered here, where 1 is the largest. About 101,238 people live in Franklin County, Washington, spread over 1,241.596 square miles.
What to do next if you own or are buying in Franklin County
14 of Franklin County's 26,598 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
Where Franklin County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Franklin County's compliance figure is one of the ones affected by FEMA's incomplete denominator data — the data quality guide explains what that means and how many counties it touches.