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Welcome to Lewis and Clark County ...
Time Zone: Lewis and Clark County lies in the Mountain Time Zone (MST/MDT) and observes daylight saving time.
The community of Helena is the Seat for Lewis and Clark County. Helena is also the capital of Montana.
Lewis and Clark County is one of the original counties of Montana and was founded in 1864.
From the Census Estimates for 2019, <1> Lewis and Clark had a population of 69,578 people. This is an increase of 9.75% since the last Census (which gave a population of 63,395 people in 2010).
At the time of the 2010 Census, Lewis and Clark represented 6.41% of the total population of Montana.
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This page was last modified/updated: 14 May 2023