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Hamlin County
Hamlin County
County
	Hamlin County Courthouse in Hayti in 1974
	Location within the U.S. state of South Dakota
	South Dakota's location within the U.S.
	Coordinates: 44°41′N 97°12′W / 44.68°N 97.2°W
Country	United States
State	South Dakota
Founded	1873 (created); 1878 (organized)
Named for	Hannibal Hamlin
Seat	Hayti
Largest city	Estelline
Area
• Total	538 sq mi (1,390 km2)
• Land	507 sq mi (1,310 km2)
• Water	31 sq mi (80 km2) 5.7%
Population (2020)
• Total	6,164
• Estimate (2023)	6,451
• Density	11/sq mi (4.4/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional district	At-large

Hamlin County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 6,164.^[1] Its county seat is Hayti.^[2] The county was created in 1873 and organized in 1878.^[3] It was named for Hannibal Hamlin, Lincoln's first vice-president.^[4]

Geography

The terrain of Hamlin County consists of low rolling hills, dotted with small lakes and ponds. The land is largely dedicated to agriculture.^[5] The terrain slopes to the south-southeast, and its highest point is on the eastern boundary line, near its NE corner, at 1,949 ft (594 m) ASL.^[6]

Hamlin County has a total area of 538 square miles (1,390 km²), of which 507 square miles (1,310 km²) is land and 31 square miles (80 km²) (5.7%) is water.^[7]

Major highways

Adjacent counties

Codington County - north
Deuel County - east
Brookings County - southeast
Kingsbury County - southwest
Clark County - west

Protected areas

Source:^[5]

Baxter Slough State Public Shooting Area
Bochek State Public Shooting Area
Eidsness State Public Shooting Area
Hamlin State Public Shooting Area
Harju State Public Shooting Area
Hayes Slough State Public Shooting Area
Johnsons Slough State Public Shooting Area
McShane State Public Shooting Area
Opdahl Slough State Public Shooting Area
Rasmussen State Public Shooting Area

Lakes

Source:^[5]

Clear Lake
Dry Lake
Lake Albert (partial)
Lake Marsh
Lake Mary
Lake Norden
Lake Poinsett
Lake Saint John

Demographics

Historical population
Census	Pop.	Note	%±
1880	693		—
1890	4,623		567.1%
1900	5,945		28.6%
1910	7,475		25.7%
1920	8,054		7.7%
1930	8,299		3.0%
1940	7,562		−8.9%
1950	7,058		−6.7%
1960	6,303		−10.7%
1970	5,172		−17.9%
1980	5,261		1.7%
1990	4,974		−5.5%
2000	5,540		11.4%
2010	5,903		6.6%
2020	6,164		4.4%
2023 (est.)	6,451	^[8]	4.7%
U.S. Decennial Census^[9] 1790-1960^[10] 1900-1990^[11] 1990-2000^[12] 2010-2020^[1]

2020 census

As of the 2020 census, there were 6,164 people, 2,155 households, and 1,513 families residing in the county.^[13] The population density was 12.2 inhabitants per square mile (4.7/km²). There were 2,759 housing units.

2010 census

As of the 2010 census, there were 5,903 people, 2,108 households, and 1,483 families in the county. The population density was 11.6 inhabitants per square mile (4.5/km²). There were 2,760 housing units at an average density of 5.4 units per square mile (2.1 units/km²). The racial makeup of the county was 96.7% white, 0.3% American Indian, 0.2% black or African American, 0.2% Asian, 1.8% from other races, and 0.8% from two or more races. Those of Hispanic or Latino origin made up 2.5% of the population. In terms of ancestry, 42.3% were German, 24.0% were Norwegian, 7.0% were English, 6.1% were Irish, 5.4% were Dutch, and 5.3% were American.

Of the 2,108 households, 33.2% had children under the age of 18 living with them, 61.4% were married couples living together, 5.6% had a female householder with no husband present, 29.6% were non-families, and 25.6% of all households were made up of individuals. The average household size was 2.68 and the average family size was 3.28. The median age was 36.8 years.

The median income for a household in the county was $44,439 and the median income for a family was $54,483. Males had a median income of $36,921 versus $24,645 for females. The per capita income for the county was $21,558. About 4.9% of families and 7.5% of the population were below the poverty line, including 11.5% of those under age 18 and 7.9% of those age 65 or over.

Communities

Cities

Towns

Hayti (county seat)
Hazel

Census-designated place

Unincorporated communities

Source:^[5]

Baxter Slough
Dempster
Thomas

Townships

Brantford
Castlewood
Cleveland
Dempster
Dixon
Estelline
Florence
Garfield
Hamlin
Hayti
Norden
Opdahl
Oxford

Politics

Hamlin County voters have usually voted Republican. In only one national election since 1932 has the county selected the Democratic Party candidate.

United States presidential election results for Hamlin County, South Dakota^[14]
Year	Republican		Democratic		Third party(ies)
Year	No.	%	No.	%	No.	%
2024	2,560	79.36%	610	18.91%	56	1.74%
2020	2,372	76.94%	647	20.99%	64	2.08%
2016	2,051	74.26%	555	20.09%	156	5.65%
2012	1,803	64.55%	921	32.98%	69	2.47%
2008	1,661	59.60%	1,043	37.42%	83	2.98%
2004	1,946	64.63%	1,015	33.71%	50	1.66%
2000	1,731	63.57%	923	33.90%	69	2.53%
1996	1,352	49.02%	1,101	39.92%	305	11.06%
1992	1,133	41.35%	826	30.15%	781	28.50%
1988	1,380	52.06%	1,258	47.45%	13	0.49%
1984	1,782	64.54%	963	34.88%	16	0.58%
1980	1,885	62.69%	903	30.03%	219	7.28%
1976	1,452	50.66%	1,402	48.92%	12	0.42%
1972	1,693	56.85%	1,276	42.85%	9	0.30%
1968	1,649	56.36%	1,149	39.27%	128	4.37%
1964	1,525	49.42%	1,561	50.58%	0	0.00%
1960	2,139	63.49%	1,230	36.51%	0	0.00%
1956	2,083	61.68%	1,294	38.32%	0	0.00%
1952	2,391	71.48%	954	28.52%	0	0.00%
1948	1,608	53.98%	1,326	44.51%	45	1.51%
1944	1,811	63.97%	1,020	36.03%	0	0.00%
1940	2,279	64.00%	1,282	36.00%	0	0.00%
1936	1,857	52.25%	1,622	45.64%	75	2.11%
1932	1,267	39.23%	1,920	59.44%	43	1.33%
1928	1,959	63.19%	1,088	35.10%	53	1.71%
1924	1,144	52.38%	207	9.48%	833	38.14%
1920	1,322	63.68%	337	16.23%	417	20.09%
1916	1,039	57.82%	692	38.51%	66	3.67%
1912	0	0.00%	474	29.92%	1,110	70.08%
1908	1,095	68.57%	434	27.18%	68	4.26%
1904	1,197	75.76%	307	19.43%	76	4.81%
1900	928	62.79%	509	34.44%	41	2.77%
1896	702	55.10%	559	43.88%	13	1.02%
1892	537	50.80%	161	15.23%	359	33.96%