Lewis and Clark County ZIP Codes

Lewis and Clark County is a county of Montana.

ZIP codes: 15
Cities & towns: 8
Area codes: 1
Land area: 3,458 sq mi

Every ZIP code in Lewis and Clark County

594xx–596xx

The complete list of Lewis and Clark County, MT ZIP codes with the city each one delivers to.
ZIP code	City
59410	Augusta
59601	Helena
59602	Helena
59604	Helena
59620	Helena
59623	Helena
59624	Helena
59625	Helena
59626	Helena
59633	Canyon Creek
59635	East Helena
59636	Fort Harrison
59639	Lincoln
59640	Marysville
59648	Wolf Creek

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Lewis and Clark County codes above are listed without a column we would have to invent.

Cities and towns in Lewis and Clark County

A further 6 places in Lewis and Clark County appear in the postal source without a page of its own; their codes are in the table above and each one links to its own page.

Area codes covering Lewis and Clark County

Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.

406 Area code 406

Where Lewis and Clark County's ZIP codes sit

Each point is the reference point of one Lewis and Clark County ZIP code, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope every ZIP code recorded in Lewis and Clark County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated 16 July 2026. The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.