County · Montana

Lewis And Clark County

Lewis and Clark County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 70,973. Its county seat and most populous city is Helena, the state capital. The numerical designation for Lewis and Clark County is 5. The county was established on June 2, 1865, as one of the nine original counties of the Territory of Montana named Edgerton County in honor of Sidney Edgerton, first Governor of the Territory of Montana, and was renamed Lewis and Clark County on March 1, 1868, in honor of explorers Meriwether Lewis and William Clark. Lewis and Clark County is part of the Helena, Montana Micropolitan Statistical Area, and comprises the entirety of the Helena media market.

Governance bodies

Board of County Commissioners Primary
governing council

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Cities and towns 2

Reference data (Census of Governments 2022)

Census ID (PID6): 169417
FIPS state: 30
FIPS county: 049
FIPS place: 99049
Census record name: COUNTY OF LEWIS AND CLARK
Mailing address: 316 N PARK AVE, HELENA 59601