Is Denver County, CO in a flood zone?
FEMA's National Risk Index puts Denver County's flood hazard at the 95.3th percentile nationally — well above the national norm for flood 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. 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
Denver 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 Denver 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.
Denver County against the rest of the country
Denver County sits at rank 161 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 95 of 3144 by population (1 is biggest). About 729,019 people live in Denver County, Colorado, spread over 153.074 square miles.
Checking a specific address in Denver County
FEMA counts 204,838 residential structures in Denver County overall, 765 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 Denver County's numbers. See the data quality guide for why Denver County, like hundreds of other counties, doesn't get a clean compliance percentage.