ZIP 52321 — Climate & Environment

FEMA’s National Risk Index rates natural-hazard risk for Onslow city, IA as Very Low (composite score 32.7), which is relatively lower than many U.S. communities. The strongest component scores on US5 are flood (46.4) and wildfire (27.4). These scores are county-linked NRI values published for planning context — all ZIP codes in the same county share the same composite score on US5. Useful when comparing insurance and disaster exposure across areas, not a substitute for a parcel-level flood or fire determination.