Lewis and Clark County Flag

Lewis and Clark County

State:
Montana
County Seat:
Helena

Lewis and Clark County's estimated 2025 population is 77,465 with a growth rate of 1.61% in the past year according to the most recent United States census data. Lewis and Clark County is the 6th largest county in Montana. The 2010 population was 63,578 and has seen a growth of 21.84% since that time.

77,465
Total Population
22
Population Density (mi²)
6
Population Rank (State)
1.2K 1.61%
Annual Population Growth

Lewis and Clark County Population

Demographics

Economics and Income Statistics