FEMA National Risk Index for a US county — the authoritative natural-hazard risk profile. Look up by countyFips (5-digit STCOFIPS), by state + county name, or by a lat/lon point. Returns the composite Risk Index score/rating/national-percentile (an 18-hazard model combining Expected Annual Loss × Social Vulnerability ÷ Community Resilience), each component (expected annual loss in dollars, social vulnerability, community resilience) with its rating, and per-hazard risk ratings + expected-annual-loss for all 18 natural hazards (wildfire, earthquake, hurricane, riverine & coastal flooding, tornado, heat/cold wave, drought, etc.). The structural natural-hazard risk picture an LLM can't recall — for siting, insurance, and resilience planning. Free, public-domain. Complements geo.flood-zone (which is flood SFHA only).

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