Shiawassee County, MI flood risk explained
Flood hazard in Shiawassee County sits at the 55.2th national percentile, 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 once every 2 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
28.1% of the homes FEMA requires to carry flood insurance in Shiawassee County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 204 policies against 726 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Looking beyond the mandated zone, 1.2% of all residential structures in Shiawassee County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Shiawassee County ranks
Among the 3144 US counties FEMA scores for flood hazard, Shiawassee County ranks 1472 — 1 being the highest hazard nationally — and 804 by population among all 3144 counties covered here, where 1 is the largest. Shiawassee County, Michigan covers 531.126 square miles and counts roughly 67,982 residents.
Your street may differ from Shiawassee County's average
215 of Shiawassee County's 18,763 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
Where Shiawassee County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. If you're unsure why any of this insurance requirement exists at all, the SFHA explainer covers it from first principles.