Overview

Lewis and Clark County sits in the west‑central portion of the U.S. state of Montana. Its county seat and largest city is Helena, which also serves as the state capital. At the time of the 2010 United States Census (2010 Census) the county had 63,395 residents. The county combines an urban center around Helena with broad mountain, valley and river landscapes that define much of Montana's interior.

Geography and environment

Topographically the county includes portions of mountain ranges, forested slopes and valley floors. Woodland, alpine terrain and rivers provide habitat for regional wildlife and create opportunities for hiking, fishing and winter sports. The climate is continental, with cold winters and warm summers, and large daily and seasonal temperature swings typical of inland high‑elevation regions.

Natural features and public lands:

  • Forested ridges and mountain trails near Helena
  • River corridors and creeks that feed larger watersheds
  • Public lands and dispersed recreation areas supporting outdoor tourism

History and name

The county's name honors the explorers Meriwether Lewis and William Clark. Helena grew rapidly as a gold rush camp in the 19th century and later became the administrative center of the region. The county was organized during Montana's territorial era and its development has been shaped by mining, transportation and government institutions.

Economy and government

As the location of the state capital, government employment and public services are major components of the local economy. The area's historical mining industry left a legacy of mineral exploration and cultural sites. Agriculture, small business, healthcare, education and a growing recreation and tourism sector also contribute to the county's economy.

Communities and culture — Helena is the civic, cultural and economic hub and functions as the county seat (county seat). In addition to Helena, the county contains smaller towns and unincorporated communities that reflect rural Montana life. Visitors and residents alike are drawn to downtown historic districts, the state capitol building, museums and a calendar of outdoor events and festivals.

For more detailed administrative, demographic or visiting information consult county and state resources: Montana and local county pages provide maps, services and current statistics.