How much flood risk does Glenn County actually carry?
Glenn County lands at the 42.3th percentile of FEMA's National Risk Index for flooding, "Relatively Low" territory — below the national norm for flood hazard — with the hazard driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about once every 1 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 Glenn County
Homes with a federally backed mortgage inside Glenn 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, 23.1% of them do — 272 active policies against 1,178 structures FEMA counts in that zone, leaving a real compliance gap. Across all residential structures in Glenn County, not just the ones FEMA mandates, 3.3% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Glenn County ranks
Glenn County sits at rank 1876 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 1500 of 3144 by population (1 is biggest). Glenn County, California is home to about 28,304 people across 1,313.94 square miles of land.
Your street may differ from Glenn County's average
FEMA counts 9,569 residential structures in Glenn County overall, 319 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Glenn 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.