St. Louis County is a county located in the Arrowhead Region of the U.S. state of Minnesota. As of the 2020 census, the population was 200,231. Its county seat is Duluth. It is the largest county in Minnesota by land area, and the largest in the United States by total area east of the Mississippi River. St. Louis County is included in the Duluth, MN–Superior, WI Metropolitan Statistical Area.

Major industries include pulpwood production and tourism. Open pit mining of taconite and processing it into high grade iron ore remains an important part of the economy of the Iron Range and is directly tied to shipping in the twin ports of Duluth and Superior. Parts of the federally recognized Bois Forte and Fond du Lac Indian reservations are in the county.

This area was long inhabited by Algonquian-speaking tribes: the Ojibwe (Chippewa), Ottawa and Potawatomi peoples were loosely affiliated in the Council of Three Fires. As American settlers entered the territory, the Native Americans were pushed to outer areas.

The Minnesota Legislature established St. Louis County on February 20, 1855, as Doty County, and changed its name to Newton County on March 3, 1855. It originally consisted of the area east and south of the St. Louis River, while the area east of the Vermilion River and north of the St. Louis River was part of Superior County. Superior County was renamed St. Louis County.

On March 1, 1856, that St. Louis County was renamed as Lake County. Newton County was renamed as St. Louis County and had that eastern area added to it; it was also expanded westward by incorporating parts of Itasca County, which then also included most of Carlton County. On May 23, 1857, St. Louis County took its current shape when Carlton County was formed from parts of St. Louis and Pine counties.

According to the United States Census Bureau, the county has a total area of 6,860 square miles (17,800 km), of which 6,247 square miles (16,180 km) is land and 612 square miles (1,590 km) (8.9%) is water. It is the largest county in Minnesota and the largest (by total area) in the United States east of the Mississippi River. St. Louis County is the only county in the United States which has a coastline and borders both another country and another state.

Voyageurs National Park, established in 1975, is located in its northwestern corner, on the south shore of Rainy Lake on the Canada–US border; it is popular with water enthusiasts and fishers. The county includes parts of Superior National Forest, established in 1909, and the Boundary Waters Canoe Area Wilderness on the border, established in 1978. The BWCAW is a 1,090,000-acre (4,400 km) wilderness area designated for fishing, camping, hiking, and canoeing, and is one of the most visited wilderness areas in the United States. St. Louis County has more than 500 lakes. The largest lakes are Pelican and Vermilion.

The "Hill of Three Waters" on the Laurentian Divide lies northeast of Hibbing. Rainfall on this hill runs to three watersheds: Hudson Bay to the north, the Gulf of Saint Lawrence to the east (via Lake Superior), or the Gulf of Mexico to the south and west (via the Mississippi River). The county is drained by the St. Louis, Vermilion, and other rivers.

Duluth on Lake Superior is one of the most important fresh-water ports in the United States.

The county encompasses part of the Iron Range. It has had a significant taconite mining industry, with active mines located in Hibbing, Mountain Iron, Eveleth, Virginia, and Babbitt, in addition to Keewatin in Itasca County.

• Rainy River District, Ontario, Canada (north)
• Lake County (east)
• Douglas County, Wisconsin (southeast)
• Carlton County (south)
• Aitkin County (southwest)
• Itasca County (west)
• Koochiching County (northwest)

• Superior National Forest (part)
  • Boundary Waters Canoe Area Wilderness (part)
• Voyageurs National Park (part)

The county has a humid continental climate (Köppen Dfb), slightly moderated by its proximity to Lake Superior. Winters are long, snowy, and very cold, normally seeing maximum temperatures remaining below 32 °F (0 °C) on 106 days. Due to global warming, in January 2019 Tracy Twine, professor at the University of Minnesota's Department of Soil, Water and Climate, said "we just don't expect temperatures to be below 10 degrees Fahrenheit in Duluth anymore." Public schools and other government offices shut down on January 29–30, 2019 because of wind chills of −70 °F or −56.7 °C. This apparent anomaly was attributed to changes in the global jet stream due to the climate change.

Historical population

Census	Pop.	Note	%±
1860	406		—
1870	4,561		1,023.4%
1880	4,504		−1.2%
1890	44,862		896.0%
1900	82,932		84.9%
1910	163,274		96.9%
1920	206,391		26.4%
1930	204,596		−0.9%
1940	206,917		1.1%
1950	206,062		−0.4%
1960	231,588		12.4%
1970	220,693		−4.7%
1980	222,229		0.7%
1990	198,213		−10.8%
2000	200,528		1.2%
2010	200,226		−0.2%
2020	200,231		0.0%
2023 (est.)	200,514		0.1%
U.S. Decennial Census 1790–1960 1900–1990 1990–2000 2010–2020

St. Louis County, Minnesota - Demographic Profile
(NH = Non-Hispanic)

Race / Ethnicity	Pop 2010	Pop 2020	% 2010	% 2020
White alone (NH)	184,769	176,112	92.3%	88.0%
Black or African American alone (NH)	2,588	4,075	1.3%	2.0%
Native American or Alaska Native alone (NH)	4,277	4,305	2.1%	2.1%
Asian alone (NH)	1,760	1,901	0.9%	1.0%
Pacific Islander alone (NH)	60	58	nil%	nil%
Some Other Race alone (NH)	95	579	0.1%	0.3%
Mixed Race/Multi-Racial (NH)	4,168	9,598	2.1%	4.8%
Hispanic or Latino (any race)	2,409	3,603	1.2%	1.8%
Total	200,226	200,231	100%	100%

Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos can be of any race.

As of the census of 2010, there were 200,226 people in the county. The racial makeup of the county was 94.0% White, 2.2% Native American, 0.4% Black or African American, 0.9% Asian, 0.2% of some other race and 2.3% of two or more races. 1.2% were Hispanic or Latino (of any race). According to the 2010–2015 American Community Survey, the ancestral makeup was 24.3% German, 15.9% Norwegian, 13.0% Swedish, and 10.2% Irish.

As of the census of 2000, there were 200,528 people, 82,619 households, and 51,389 families in the county. The population density was 32 people per square mile (12 people/km). There were 95,800 housing units at an average density of 15 per square mile (5.8/km). The racial makeup of the county was 94.9% White, 0.9% Black or African American, 2.0% Native American, 0.7% Asian, nil% Pacific Islander, 0.2% from other races, and 1.4% from two or more races. 0.8% of the population were Hispanic or Latino of any race.

27.6% of households included children under the age of 18, 49.3% were married couples living together, 9.4% had a female householder with no husband present, and 37.8% were non-families. 31.2% of all households consisted of individuals, and 13.0% of individuals 65 years of age or older. The average household size was 2.32 and the average family size was 2.90.

The population contained 22.4% under the age of 18, 11.4% from 18 to 24, 25.9% from 25 to 44, 24.3% from 45 to 64, and 16.1% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 96.8 males. For every 100 females age 18 and over, there were 93.8 males.

The median income for a household in the county was $36,306, and the median income for a family was $47,134. Males had a median income of $37,934 versus $24,235 for females. The per capita income for the county was $18,982. About 7.2% of families and 12.1% of the population were below the poverty line, including 13.1% of those under age 18 and 8.9% of those age 65 or over.

St. Louis County is governed by an elected and nonpartisan board of commissioners. In Minnesota, county commissions usually have five members, but St. Louis, Hennepin, and Ramsey counties have seven-member boards. Each commissioner represents a single-member district of equal population.

The county commission elects a chair who presides at meetings.

Commissioners as of January 2023:

District	Commissioner	In office since	Current term expires
1st	Annie Harala	2023	January 4, 2027
2nd	Patrick Boyle (chair)	2014	January 6, 2025
3rd	Ashley Grimm	2021	January 6, 2025
4th	Paul McDonald	2019	January 4, 2027
5th	Keith Musolf	2019	January 6, 2025
6th	Keith Nelson (vice-chair)	2003	January 4, 2027
7th	Mike Jugovich	2017	January 6, 2025

Election results from statewide races
Year	Office	GOP	DFL	Others
2024	President	42.1%	55.7%	2.2%
	Senator	35.2%	61.6%	3.2%
2022	Governor	38.1%	57.7%	4.2%
2020	President	41.0%	56.6%	2.4%
	Senator	38.4%	53.8%	7.8%
2018	Governor	35.4%	60.8%	2.9%
	Senator	30.5%	66.2%	2.5%
	Senator (Special)	34.7%	60.6%	3.7%
2016	President	39.7%	51.4%	8.9%
2014	Governor	32.5%	62.1%	2.4%
	Senator	32.0%	64.2%	2.3%
2012	President	33.9%	63.5%	2.7%
	Senator	23.0%	73.8%	2.0%
2010	Governor	28.6%	61.8%	8.3%
2008	President	32.6%	65.1%	2.3%
	Senator	32.4%	54.6%	13.0%
2006	Governor	29.3%	64.6%	6.1%
	Senator	25.9%	70.9%	3.2%
2004	President	33.6%	65.2%	1.2%
2002	Governor	26.5%	59.9%	13.6%
	Senator	31.6%	65.4%	3.0%
2000	President	33.0%	59.8%	7.2%
	Senator	31.7%	63.3%	5.0%
1998	Governor	28.1%	47.3%	24.6%
1996	President	25.5%	60.6%	13.9%
	Senator	28.5%	64.7%	6.8%
1994	Governor	44.6%	53.0%	2.4%
	Senator	35.9%	56.9%	7.2%
1992	President	22.6%	56.8%	20.6%

In 2007, St. Louis County considered doing a study about dividing into two counties, but the proposal was not acted on.

This county is one of the most reliably Democratic counties in the state, as no Republican or Independent candidate has won the county in a statewide election since 1992. The only time a Democrat obtained less than 50% of the vote was in 1998, when Jesse Ventura of the Reform ticket won statewide; some 24% of the county voted for him. Since 1992, the only time when a Republican obtained more than 34% of the vote was in the elections of 1994 (the year of the Republican Revolution) when the incumbent Independent-Republican governor won the statewide vote by a landslide of more than 60%, and when the Independent-Republican senatorial candidate won election with 49% statewide, both of which are rare occurrences in Minnesota.

St. Louis County has long been one of the strongest Democratic bastions in the state outside of the Twin Cities. The Democrats have carried the county for 24 consecutive presidential elections; the last Republican candidate to carry the county was Herbert Hoover in 1928, before the Great Depression. In recent elections, Republicans have received about 1/3rd of the county's vote. In 2016, Donald Trump earned 39.7% of the county's vote, while the Democratic vote deteriorated to 51.4% (the lowest percentage since 1932); according to exit polls, this was due to residents' concerns about the decline of mining and forestry in the county. This was the closest that a Republican had come to winning the county since 1932. In 2020, Trump became the first Republican since Herbert Hoover to get more than 40% of the vote in St. Louis County, but Joe Biden bolstered the Democratic margin of victory from 11.7% to 15.6%.

United States presidential election results for St. Louis County, Minnesota

Year	Republican		Democratic		Third party(ies)
	No.	%	No.	%	No.	%
2024	50,065	42.07%	66,335	55.74%	2,609	2.19%
2020	49,017	41.01%	67,704	56.64%	2,810	2.35%
2016	44,630	39.70%	57,771	51.39%	10,021	8.91%
2012	39,131	33.85%	73,378	63.48%	3,085	2.67%
2008	38,742	32.61%	77,351	65.10%	2,721	2.29%
2004	40,112	33.55%	77,958	65.20%	1,495	1.25%
2000	35,420	32.96%	64,237	59.78%	7,807	7.26%
1996	25,553	25.50%	60,736	60.62%	13,907	13.88%
1992	24,579	22.59%	61,813	56.81%	22,423	20.61%
1988	31,799	30.80%	70,344	68.14%	1,094	1.06%
1984	34,162	30.27%	77,683	68.83%	1,013	0.90%
1980	33,407	29.13%	69,403	60.52%	11,864	10.35%
1976	35,331	30.97%	75,040	65.78%	3,704	3.25%
1972	41,435	39.77%	61,103	58.65%	1,642	1.58%
1968	25,981	25.52%	72,267	70.99%	3,549	3.49%
1964	25,246	24.00%	79,529	75.61%	408	0.39%
1960	39,620	36.18%	69,270	63.25%	632	0.58%
1956	39,902	38.84%	62,190	60.54%	631	0.61%
1952	38,900	37.66%	63,032	61.03%	1,354	1.31%
1948	28,490	29.28%	62,553	64.29%	6,249	6.42%
1944	27,493	29.90%	63,369	68.92%	1,080	1.17%
1940	32,243	31.42%	68,620	66.87%	1,760	1.72%
1936	22,332	23.88%	69,365	74.18%	1,813	1.94%
1932	34,883	41.66%	40,181	47.99%	8,665	10.35%
1928	44,331	61.13%	25,401	35.03%	2,785	3.84%
1924	37,033	57.31%	2,577	3.99%	25,013	38.71%
1920	27,987	56.98%	14,767	30.07%	6,361	12.95%
1916	10,834	41.47%	12,056	46.15%	3,234	12.38%
1912	3,881	18.59%	5,124	24.54%	11,873	56.87%
1908	12,076	66.08%	4,464	24.43%	1,734	9.49%
1904	10,375	77.74%	1,972	14.78%	998	7.48%
1900	8,851	63.72%	4,667	33.60%	372	2.68%
1896	9,810	56.36%	7,412	42.58%	184	1.06%
1892	5,157	49.67%	3,586	34.54%	1,640	15.80%

St. Louis County is in Minnesota's 8th congressional district. For 36 years it was represented by Democrat Jim Oberstar. He was defeated in 2010 by Republican Chip Cravaack. Two years later Cravaack was defeated by Democrat Rick Nolan, who represented the district until his retirement in 2019. Republican St. Louis County commissioner Pete Stauber succeeded Nolan in one of three Democrat-to-Republican district flips in 2018, two of which happened in Minnesota.

• Mahnomen
• Nett Lake
• Soudan

• Carson Lake
• Costin Village
• Elcor
• Fermoy
• Spina

• National Register of Historic Places listings in St. Louis County, Minnesota
• Independent School District 2142

• St. Louis County Government site – Link
• Duluth News Tribune site
• Mn/DOT maps of St. Louis County (Southwest portion, West–Central portion, Southeast portion, East–Central portion, Northern part of West–Central portion, Northwest portion, Northeast portion)

47°35′N 92°28′W / 47.58°N 92.46°W / 47.58; -92.46