What to know about ZIP 59623
ZIP code 59623 covers Helena, MT in Lewis and Clark County.
It sits in telephone area code 406; U.S. House district MT-2; the HELENA media market.
Helena city, MT
ZIP Code 59623 — Helena city, MT Demographics & Data
Source: U.S. Census Bureau ACS 2019–2023 5-Year Estimates. Page data updated 2026-08-02.
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At a glance
Overview of ZIP Code 59623
Climate risk and migration signals
FEMA’s National Risk Index rates natural-hazard risk for Helena city, MT as Relatively Low (composite score 71.2), which is elevated versus much of the country. The strongest component scores on US5 are wildfire (92.8) and flood (64.6). 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.
Climate normals for Helena city, MT show limited published climate normals on US5.