Lewis and Clark

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 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.