Doña Ana County, NM: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Doña Ana County scores at the 98.4th percentile for flood hazard, rated "Relatively High" — well above 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 2.5 times a year. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Doña Ana County's flood-insurance compliance gap
Homes with a federally backed mortgage inside Doña Ana County's mapped high-risk flood zone (the Special Flood Hazard Area, or SFHA) are legally required to carry an NFIP flood policy. In practice, 15.9% of them do — 676 active policies against 4,258 structures FEMA counts in that zone, leaving a real compliance gap. Looking beyond the mandated zone, 1.2% of all residential structures in Doña Ana County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Doña Ana County against the rest of the country
Among the 3144 US counties FEMA scores for flood hazard, Doña Ana County ranks 59 — 1 being the highest hazard nationally — and 314 by population among all 3144 counties covered here, where 1 is the largest. Doña Ana County, New Mexico covers 3,808.179 square miles and counts roughly 229,366 residents.
Your street may differ from Doña Ana County's average
947 of Doña Ana County's 76,673 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
Where Doña Ana 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.