Is Gilliam County, OR in a flood zone?
FEMA's National Risk Index puts Gilliam County's flood hazard at the 7th percentile nationally — among the lowest flood hazard in the country — driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about once every 14 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
Gilliam County is one of the counties where FEMA's own denominator for mandated flood-zone structures is missing, so no compliance rate is shown rather than a guessed one — the data quality guide covers how common this is. Across all residential structures in Gilliam County, not just the ones FEMA mandates, 0.4% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Gilliam County ranks
Gilliam County sits at rank 2937 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 3043 of 3144 by population (1 is biggest). Gilliam County, Oregon covers 1,204.721 square miles and counts roughly 1,971 residents.
Your street may differ from Gilliam County's average
4 of Gilliam County's 989 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Gilliam County's numbers. See the data quality guide for why Gilliam County, like hundreds of other counties, doesn't get a clean compliance percentage.