Is Mariposa County, CA in a flood zone?
FEMA's National Risk Index puts Mariposa County's flood hazard at the 70.8th percentile nationally — below 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 2.1 times a year. 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
0% of the homes FEMA requires to carry flood insurance in Mariposa County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 0 policies against 49 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Across all residential structures in Mariposa County, not just the ones FEMA mandates, 0% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Mariposa County against the rest of the country
Mariposa County sits at rank 957 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 1974 of 3144 by population (1 is biggest). Mariposa County, California is home to about 17,048 people across 1,448.84 square miles of land.
Your street may differ from Mariposa County's average
FEMA counts 8,388 residential structures in Mariposa County overall, 0 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 Mariposa 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.