How much flood risk does Liberty County actually carry?
Liberty County lands at the 11.9th percentile of FEMA's National Risk Index for flooding, "Very Low" territory — among the lowest flood hazard in the country — 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 14 years. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Mandatory flood insurance compliance in Liberty County
Liberty County is one of the counties where FEMA's own denominator for mandated flood-zone structures is missing, so no compliance rate is shown rather than a guessed one — the data quality guide covers how common this is. Across all residential structures in Liberty County, not just the ones FEMA mandates, 0.3% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Liberty County ranks
Liberty County sits at rank 2793 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 3044 of 3144 by population (1 is biggest). Liberty County, Montana covers 1,429.988 square miles and counts roughly 1,934 residents.
Your street may differ from Liberty County's average
4 of Liberty County's 1,630 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 Liberty County's numbers. See the data quality guide for why Liberty County, like hundreds of other counties, doesn't get a clean compliance percentage.