Carbon County, WY: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Carbon County scores at the 50.3th percentile for flood hazard, rated "Relatively Low" — below the national norm for flood hazard. 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 4 years. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Mandatory flood insurance compliance in Carbon County
FEMA hasn't published a residential structure count for Carbon 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, 0.7% of all residential structures in Carbon County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Carbon County ranks
Among the 3144 US counties FEMA scores for flood hazard, Carbon County ranks 1626 — 1 being the highest hazard nationally — and 2144 by population among all 3144 counties covered here, where 1 is the largest. Carbon County, Wyoming covers 7,897.746 square miles and counts roughly 14,250 residents.
What to do next if you own or are buying in Carbon County
FEMA counts 8,669 residential structures in Carbon County overall, 64 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
Where Carbon County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Carbon 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.