Is Marion County, MO in a flood zone?
FEMA's National Risk Index puts Marion County's flood hazard at the 59.3th 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 1.3 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
7.3% of the homes FEMA requires to carry flood insurance in Marion County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 35 policies against 479 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Across all residential structures in Marion 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 Marion County ranks
Marion County sits at rank 1340 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 1492 of 3144 by population (1 is biggest). Marion County, Missouri covers 436.931 square miles and counts roughly 28,425 residents.
What to do next if you own or are buying in Marion County
50 of Marion County's 12,742 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 Marion 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.