There are 11 zip codes in Lewis and Clark County, Montana. The most populated is 59601, located in Helena. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
5960131,447Helena
5960229,846Helena
596357,815East Helena
596391,171Lincoln
59410621Augusta
59648335Wolf Creek
59633289Canyon Creek
59625155Helena
5964067Marysville
5963627Fort Harrison
596230Helena

Zip Codes in Lewis and Clark County, Montana by Population (2024)