Jefferson County, OR: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Jefferson County scores at the 36.6th percentile for flood hazard, rated "Relatively Low" — below 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 once every 28 years. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Who actually carries the flood insurance FEMA requires
FEMA hasn't published a residential structure count for Jefferson 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, 0.6% of all residential structures in Jefferson County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
How Jefferson County compares nationally
Among the 3144 US counties FEMA scores for flood hazard, Jefferson County ranks 2056 — 1 being the highest hazard nationally — and 1604 by population among all 3144 counties covered here, where 1 is the largest. Jefferson County, Oregon covers 1,781.696 square miles and counts roughly 25,536 residents.
Checking a specific address in Jefferson County
Across all of Jefferson County's 10,302 residential structures, 64 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
Where Jefferson County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Jefferson 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.