Fallon County, MT: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Fallon County scores at the 5.5th percentile for flood hazard, rated "Very Low" — among the lowest flood hazard in the country. The hazard here is 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. 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
FEMA hasn't published a residential structure count for Fallon County's mapped flood zone, so a reliable mandatory-compliance percentage can't be computed here — see the data quality guide for why this gap exists for roughly a quarter of US counties. Looking beyond the mandated zone, 0.1% of all residential structures in Fallon County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
How Fallon County compares nationally
Among the 3144 US counties FEMA scores for flood hazard, Fallon County ranks 2980 — 1 being the highest hazard nationally — and 2960 by population among all 3144 counties covered here, where 1 is the largest. About 2,946 people live in Fallon County, Montana, spread over 1,620.595 square miles.
What to do next if you own or are buying in Fallon County
2 of Fallon County's 2,277 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
Where Fallon County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Fallon County's compliance figure is one of the ones affected by FEMA's incomplete denominator data — the data quality guide explains what that means and how many counties it touches.