Lewis and Clark County, Montana

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Lewis and Clark County, Montana
Seal of Lewis and Clark County, Montana
Map of Montana highlighting Lewis and Clark County
Location in the state of Montana
Map of the United States highlighting Montana
Montana's location in the U.S.
Founded 1864
Named for Meriwether Lewis and William Clark
Seat Helena
Largest city Helena
 • Total 3,498 sq mi (9,060 km2)
 • Land 3,461 sq mi (8,964 km2)
 • Water 37 sq mi (96 km2), 1.05%
 • (2010) 63,395
 • Density 16/sq mi (6/km²)
Congressional district At-large
Time zone Mountain: UTC-7/-6
Website www.co.lewis-clark.mt.us

Lewis and Clark County is a county located in the U.S. state of Montana. As of the 2010 census, the population was 63,395.[1] Its county seat is Helena,[2] the state capital. The numerical designation for Lewis and Clark County (used in the issuance of the state's license plates) is 5. The county was established in 1865 as Edgerton County, and was renamed "Lewis and Clark County" two years later.

Lewis and Clark County is part of the Helena, MT Micropolitan Statistical Area.


According to the United States Census Bureau, the county has a total area of 3,498 square miles (9,059.8 km2), of which 3,461 square miles (8,963.9 km2) is land and 37 square miles (95.8 km2) (1.05%) is water.[3]

Major highways[edit]

Adjacent Counties[edit]

National protected areas[edit]

The iconic "Sleeping Giant" formation north of Helena, MT


Historical population
Census Pop.
1870 5,040
1880 6,521 29.4%
1890 19,145 193.6%
1900 19,171 0.1%
1910 21,853 14.0%
1920 18,660 −14.6%
1930 18,224 −2.3%
1940 22,131 21.4%
1950 24,540 10.9%
1960 28,006 14.1%
1970 33,281 18.8%
1980 43,039 29.3%
1990 47,495 10.4%
2000 55,716 17.3%
2010 63,395 13.8%
Est. 2012 64,876 2.3%
U.S. Decennial Census[4]
2012 Estimate[1]

As of the [5] of 2000, there were 55,716 people, 22,850 households, and 14,966 families residing in the county. The population density was 16 people per square mile (6/km²). There were 25,672 housing units at an average density of 7 per square mile (3/km²). The racial makeup of the county was 95.21% white, 0.20% Black or African American, 2.04% Native American, 0.52% Asian American, 0.05% Pacific Islander American, 0.38% from other races, and 1.61% from two or more races. 1.51% of the population were Hispanic or Latino of any race. 22.6% were of German, 15.5% Irish, 10.9% English, 9.5% Norwegian and 6.1% American ancestry according to the 2000 Census.

There were 22,850 households out of which 32.20% had children under the age of 18 living with them, 52.40% were married couples living together, 9.20% had a female householder with no husband present, and 34.50% were non-families. 29.10% of all households were made up of individuals and 8.90% had someone living alone who was 65 years of age or older. The average household size was 2.38 and the average family size was 2.95.

In the county the population was spread out with 25.60% under the age of 18, 8.50% from 18 to 24, 27.90% from 25 to 44, 26.20% from 45 to 64, and 11.70% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 96.50 males. For every 100 females age 18 and over, there were 94.00 males.

The median income for a household in the county was $37,360, and the median income for a family was $46,766. Males had a median income of $33,515 versus $23,961 for females. The per capita income for the county was $18,763. About 7.30% of families and 10.90% of the population were below the poverty line, including 12.60% of those under age 18 and 6.50% of those age 65 or over.

In the county of the population that's 25 years old and over 91.4% of them have a High school diploma, 31.6% of that population has a Bachelor's degree or higher, 17.2% of the population is disabled, 1.6% of them are foreign born, and only 4.0% of the population can speak another language at home. According to the 2000 Census 59.7% of the population (male) is married but, now separated. For the women it is only 3% lower at 56.7%. The average family size is 2.95. In the county there are 25,672 homes, 2,822 of which are vacant.




Census-designated places[edit]

Unincorporated Communities[edit]

Ghost towns[edit]

Notable residents[edit]

  • Seth Bullock, sheriff of Lewis and Clark County, and later served as sheriff of Deadwood, South Dakota.
  • Mike McGrath, current Chief Justice of the Montana Supreme Court, former Montana Attorney General, previously served as County Attorney of Lewis and Clark County.
  • Johnny Miljus, major league baseball pitcher, retired to Fort Harrison in Lewis and Clark County.
  • W. A. Boyle, president of the United Mine Workers of America, was born in Bald Butte, about two miles southwest of Marysville.
  • Brian Knight, Major League Baseball umpire
  • All of the Governors of the state of Montana, whose capital city, Helena, is in this county.

See also[edit]


  1. ^ a b "State & County QuickFacts". United States Census Bureau. Retrieved September 15, 2013. 
  2. ^ "Find a County". National Association of Counties. Retrieved 2011-06-07. 
  3. ^ "Census 2010 Gazetteer Files". Retrieved July 2, 2013. 
  4. ^ "U.S. Decennial Census". Census.gov. Retrieved September 15, 2013. 
  5. ^ "American FactFinder". United States Census Bureau. Retrieved 2008-01-31. 

External links[edit]

Coordinates: 47°07′N 112°23′W / 47.11°N 112.38°W / 47.11; -112.38