How much flood risk does Ingham County actually carry?
Ingham County lands at the 88.5th percentile of FEMA's National Risk Index for flooding, "Relatively Moderate" territory — a middling flood hazard by national standards — with the hazard driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about once every 3 years. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Who actually carries the flood insurance FEMA requires
29.9% of the homes FEMA requires to carry flood insurance in Ingham County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 475 policies against 1,590 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Across all residential structures in Ingham County, not just the ones FEMA mandates, 0.7% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Ingham County ranks
Ingham County sits at rank 379 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 253 of 3144 by population (1 is biggest). About 290,427 people live in Ingham County, Michigan, spread over 556.081 square miles.
What to do next if you own or are buying in Ingham County
FEMA counts 85,964 residential structures in Ingham County overall, 608 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 Ingham 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.