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Stillwater County
Stillwater County
County
	Beartooth Mountains from Park City
	Location within the U.S. state of Montana
	Montana's location within the U.S.
	Coordinates: 45°40′N 109°23′W / 45.67°N 109.39°W
Country	United States
State	Montana
Founded	1913
Named for	Stillwater River
Seat	Columbus
Largest town	Columbus
Area
• Total	1,805 sq mi (4,670 km2)
• Land	1,795 sq mi (4,650 km2)
• Water	9.2 sq mi (24 km2) 0.5%
Population (2020)
• Total	8,963
• Estimate (2022)	9,177
• Density	5.0/sq mi (1.9/km2)
Time zone	UTC−7 (Mountain)
• Summer (DST)	UTC−6 (MDT)
Congressional district	2nd
Website	www.stillwater.mt.gov
	Montana county number 32;

Stillwater County is a county in the U.S. state of Montana. As of the 2020 census, the population was 8,963.^[1] Its county seat is Columbus.^[2]

Geography

According to the United States Census Bureau, the county has a total area of 1,805 square miles (4,670 km²), of which 1,795 square miles (4,650 km²) is land and 9.2 square miles (24 km²) (0.5%) is water.^[3]

Major highways

Adjacent counties

National protected areas

Demographics

Historical population
Census	Pop.	Note	%±
1920	7,630		—
1930	6,253		−18.0%
1940	5,694		−8.9%
1950	5,416		−4.9%
1960	5,526		2.0%
1970	4,632		−16.2%
1980	5,598		20.9%
1990	6,536		16.8%
2000	8,195		25.4%
2010	9,117		11.3%
2020	8,963		−1.7%
2022 (est.)	9,177	^[4]	2.4%
U.S. Decennial Census^[5] 1790–1960,^[6] 1900–1990,^[7] 1990–2000,^[8] 2010–2020^[1]

2020 census

As of the 2020 census, there were 8,963 people living in the county.^{[citation needed]}

2010 census

As of the 2010 census, there were 9,117 people, 3,796 households, and 2,657 families in the county. The population density was 5.1 inhabitants per square mile (2.0/km²). There were 4,803 housing units at an average density of 2.7 units per square mile (1.0 units/km²). The racial makeup of the county was 96.8% white, 0.8% American Indian, 0.3% Asian, 0.1% black or African American, 0.4% from other races, and 1.6% from two or more races. Those of Hispanic or Latino origin made up 2.3% of the population. In terms of ancestry, 34.7% were German, 14.1% were Irish, 14.0% were English, 10.8% were Norwegian, and 6.9% were American.

Of the 3,796 households, 28.9% had children under the age of 18 living with them, 60.6% were married couples living together, 6.0% had a female householder with no husband present, 30.0% were non-families, and 25.8% of all households were made up of individuals. The average household size was 2.37 and the average family size was 2.84. The median age was 45.7 years.

The median income for a household in the county was $57,227 and the median income for a family was $65,438. Males had a median income of $51,830 versus $26,909 for females. The per capita income for the county was $27,168. About 6.0% of families and 9.5% of the population were below the poverty line, including 17.9% of those under age 18 and 7.2% of those age 65 or over.

Politics

Stillwater County is a heavily Republican county in presidential elections. It has not voted for a Democratic presidential candidate since Franklin D. Roosevelt in 1936.

United States presidential election results for Stillwater County, Montana^[9]
Year	Republican		Democratic		Third party(ies)
Year	No.	%	No.	%	No.	%
2024	4,699	79.56%	1,056	17.88%	151	2.56%
2020	4,462	77.72%	1,156	20.14%	123	2.14%
2016	3,661	75.13%	908	18.63%	304	6.24%
2012	3,337	70.97%	1,248	26.54%	117	2.49%
2008	2,991	64.09%	1,512	32.40%	164	3.51%
2004	3,090	73.34%	1,025	24.33%	98	2.33%
2000	2,765	70.57%	925	23.61%	228	5.82%
1996	1,871	49.24%	1,282	33.74%	647	17.03%
1992	1,390	38.19%	1,178	32.36%	1,072	29.45%
1988	1,920	56.82%	1,407	41.64%	52	1.54%
1984	2,118	65.01%	1,100	33.76%	40	1.23%
1980	1,828	61.26%	919	30.80%	237	7.94%
1976	1,446	54.88%	1,143	43.38%	46	1.75%
1972	1,698	67.95%	716	28.65%	85	3.40%
1968	1,347	61.20%	676	30.71%	178	8.09%
1964	1,140	50.20%	1,130	49.76%	1	0.04%
1960	1,455	58.41%	1,036	41.59%	0	0.00%
1956	1,540	60.32%	1,013	39.68%	0	0.00%
1952	1,689	67.02%	816	32.38%	15	0.60%
1948	1,137	54.48%	890	42.64%	60	2.87%
1944	1,201	56.07%	934	43.60%	7	0.33%
1940	1,255	50.71%	1,201	48.53%	19	0.77%
1936	1,034	42.69%	1,292	53.34%	96	3.96%
1932	1,085	44.23%	1,281	52.22%	87	3.55%
1928	1,687	70.06%	711	29.53%	10	0.42%
1924	1,412	59.88%	375	15.90%	571	24.22%
1920	1,721	70.50%	664	27.20%	56	2.29%
1916	918	42.01%	1,197	54.78%	70	3.20%