Is Linn County, OR in a flood zone?
FEMA's National Risk Index puts Linn County's flood hazard at the 86.3th percentile nationally — 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 4 years. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Who actually carries the flood insurance FEMA requires
Homes with a federally backed mortgage inside Linn 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, 19.1% of them do — 382 active policies against 2,004 structures FEMA counts in that zone, leaving a real compliance gap. Across all residential structures in Linn County, not just the ones FEMA mandates, 1.1% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Linn County ranks
Linn County sits at rank 454 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 498 of 3144 by population (1 is biggest). Linn County, Oregon is home to about 132,474 people across 2,289.508 square miles of land.
Checking a specific address in Linn County
Across all of Linn County's 47,374 residential structures, 511 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Linn County's numbers. The guide to what the Special Flood Hazard Area actually means explains why the mandatory-insurance rule exists and who it applies to.