Is Wayne County, MI in a flood zone?
FEMA's National Risk Index puts Wayne County's flood hazard at the 99.4th percentile nationally — among the highest 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 3.1 times a year. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Wayne County's flood-insurance compliance gap
Out of 12,730 homes FEMA counts inside Wayne County's mapped flood zone, 2,741 carry the flood policy federal law requires there — 21.5% compliance, short of full coverage. Across all residential structures in Wayne County, not just the ones FEMA mandates, 0.5% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
How Wayne County compares nationally
Wayne County sits at rank 23 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 19 of 3144 by population (1 is biggest). Wayne County, Michigan covers 611.843 square miles and counts roughly 1,771,063 residents.
Checking a specific address in Wayne County
Across all of Wayne County's 650,804 residential structures, 3,357 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Wayne 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.