South Windsor is a town in Hartford County, Connecticut, United States. The town is part of the Capitol Planning Region. The population was 26,918 at the 2020 census.

In 1659, Thomas Burnham (1617–1688) purchased the tract of land now covered by the towns of South Windsor and East Hartford from Tantinomo, chief sachem of the Podunk Indians. Burnham lived on the land and later willed it to his nine children. Beginning in the middle of the 17th century, a few settlers from Windsor began using land on the east bank of the Connecticut River for grazing and farming purposes. By 1700, a number of families had made their homes in the area. In 1768, the residents of the area were allowed to incorporate as the separate town of East Windsor, though the area was informally referred to as East Windsor before this time. At the time, the town included all of what is now the present-day towns of East Windsor, South Windsor, and Ellington. Known for its agriculture and ship building, the town of East Windsor, including South Windsor, supplied more than 200 volunteers during the American Revolution. In 1786, Ellington became an independent town, and South Windsor was incorporated as a separate town in 1845. Tobacco has been a major crop grown in South Windsor since its founding.

(Old) Main Street, located near the Connecticut River and running north to south from the border of East Windsor to that of East Hartford, is the center of the town's historic district. The Wood Memorial Library & Museum and Ellsworth School are located on the street. Minister Timothy Edwards, the namesake of the town's middle school, is buried in a cemetery located on this street. In 1698, Edwards became the first minister for the settlers on the east side of the river, and his church was built on Main Street (in present-day South Windsor). His son, theologian Jonathan Edwards, was born in South Windsor (at the time still part of Windsor). Ulysses S. Grant stayed at a home on the street.

The town has become less and less agricultural and rural since 1950. This former farming community has been transformed into a suburban town with industrial and commercial districts. The town's population more than tripled between 1950 and 2000. In the early 1990s, residents mobilized a successful campaign against a proposed nuclear waste dump located near the East Windsor town line.

• East Windsor Hill Historic District – Roughly bounded by the Scantic River, John Fitch Boulevard, Sullivan Avenue, and the Connecticut River, added in 1986
• Elmore Houses – 78 and 87 Long Hill Road, added in 1985
• Windsor Farms Historic District – Roughly bounded by Strong Road, U.S. Route 5, Interstate 291, and the Connecticut River, added in 1986

According to the United States Census Bureau, the town has a total area of 28.7 square miles (74.3 km), of which 28.1 square miles (72.7 km) is land and 0.62 square miles (1.6 km), or 2.12%, is water.

Historical population

Census	Pop.	Note	%±
1850	1,638		—
1860	1,789		9.2%
1870	1,688		−5.6%
1880	1,902		12.7%
1890	1,736		−8.7%
1900	2,014		16.0%
1910	2,251		11.8%
1920	2,142		−4.8%
1930	2,535		18.3%
1940	2,863		12.9%
1950	4,066		42.0%
1960	9,460		132.7%
1970	15,553		64.4%
1980	17,198		10.6%
1990	22,090		28.4%
2000	24,412		10.5%
2010	25,709		5.3%
2020	26,918		4.7%
DECD

As of the census of 2000, there were 24,412 people, 8,905 households, and 6,767 families residing in the town. The population density was 873.1 inhabitants per square mile (337.1/km). There were 9,071 housing units at an average density of 324.4 per square mile (125.3/km). The racial makeup of the town was 85.95% White, 2% African American, 0.18% Native American, 3.71% Asian, 0.03% Pacific Islander, 0.66% from other races, and 0.96% from two or more races. Hispanic or Latino of any race were 2.27% of the population.

There were 8,905 households, out of which 38.5% had children under the age of 18 living with them, 65.7% were married couples living together, 7.5% had a female householder with no husband present, and 24.0% were non-families. 19.8% of all households were made up of individuals, and 6.9% had someone living alone who was 65 years of age or older. The average household size was 2.72 and the average family size was 3.16.

In the town, the population was spread out, with 27.4% under the age of 18, 5.0% from 18 to 24, 29.7% from 25 to 44, 26.0% from 45 to 64, and 11.9% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 93.0 males. For every 100 females age 18 and over, there were 88.7 males.

The median income for a household in the town was $73,990, and the median income for a family was $82,807. Males had a median income of $55,703 versus $38,665 for females. The per capita income for the town was $30,966. About 1.5% of families and 1.8% of the population were below the poverty line, including 0.8% of those under age 18 and 4.6% of those age 65 or over.

Top employers in South Windsor according to the town's 2020 Comprehensive Annual Financial Report

#	Employer	# of Employees
1	Town of South Windsor	891
2	DST Output	650
3	Ticket Network	441
4	May Company	389
5	Doosan Fuel Cell America, Inc.	320
6	Target Corporation	250
7	Stop & Shop	221
8	Performance Food Group	183
9	Lowe's	170
10	Electro-Methods, Inc.	155

Children attending the public school systems in South Windsor begin at the elementary school level (Kindergarten through Grade 5) at one of four elementary schools: Pleasant Valley, Orchard Hill, Philip R. Smith, and Eli Terry, with Wapping now used by the local recreation department, instead of previously running as a school. After graduating from elementary school, students then move on to Timothy Edwards Middle School, for grades 6–8. They also have the choice to go to a magnet school, Two Rivers Magnet Middle School in East Hartford. They then finish up their schooling at South Windsor High School. Over 140 students in the 2004, 2005, and 2006 classes have been admitted to the University of Connecticut in Storrs.

South Windsor Town Council
Type
Type	Town council
Leadership
Mayor	Audrey Delnicki, Republican
Deputy Mayor	Matthew Siracusa, Republican
Town manager	Mike Maniscalco
Structure
Seats	9
Political groups	Republican Party (6) Democratic Party (3)
Elections
Last election	November 2, 2021
Meeting place
Council Chambers, 1540 Sullivan Ave.
Website
Official website

South Windsor is governed by a council-manager form of government. The town manager is appointed by the town council and the leader of the council is designated as the mayor, with a deputy mayor also chosen from amongst the council.

The town council holds its elections every two years, on odd-numbered years. Each party nominates only up to six candidates for the nine town council positions (which are all at-large), and each voter may only vote for up to six candidates from the pool of all candidates nominated by all parties. The top nine vote-getters win seats on the town council; as a result the council always has a 5–4 or 6–3 majority (assuming only two parties are participating), ensuring representation of the minority party.

Voter Registration and Party Enrollment as of October 26, 2021
Party		Active Voters	Inactive Voters	Total Voters	Percentage
	Democratic	6,230	313	6,543	35.17%
	Republican	3,576	232	3,808	20.47%
	Unaffiliated	7,442	510	7,952	42.75%
	Minor parties	280	19	299	1.61%
Total		17,528	1,074	18,602	100%

Election results from statewide races
Year	Office	Results
2020	President	Biden 61.1–37.0%
	Congress	Larson 63.6–35.1%
2018	Governor	Lamont 47.5–44.6%
	Senator	Murphy 60.1–38.7%
	Congress	Larson 63.4–35.7%
2016	President	Clinton 54.9–40.5%
	Senator	Blumenthal 63.6–34.4%
	Congress	Larson 61.7–36.8%
2014	Governor	Foley 49.7–48.9%
	Congress	Larson 62.1–36.7%
2012	President	Obama 56.3–42.1%
	Senator	Murphy 52.8–42.9%
	Congress	Larson 65.4–27.8%
2010	Governor	Foley 50.7–48.0%
	Senator	Blumenthal 53.0–42.9%
	Congress	Larson 58.1–38.8%
2008	President	Obama 60.0–37.7%
	Congress	Larson 67.7–24.8%
2006	Governor	Rell 63.7–35.3%
	Senator	Lieberman 48.4–41.8–9.0%
	Congress	Larson 73.2–23.0%
2004	President	Kerry 54.5–44.0%
	Senator	Dodd 69.6–29.0%
	Congress	Larson 74.4–25.6%

• Israel Bissell (1752–1823), post rider, rode from Lexington to Philadelphia to warn about the British
• Nancy Caffyn (1934–2010), politician
• Marcus Camby (born 1974), National Basketball Association player
• Chris Clark (born 1976), former National Hockey League player
• Michael Donnelly (1959–2005), Gulf War veteran and activist
• Jonathan Edwards (1703–1758), theologian
• Timothy Edwards (1669–1758), clergyman, namesake of Timothy Edwards Middle School
• John Fitch (1743–1798), inventor
• Will Friedle (born 1976), actor, voice actor and comedian
• Alex Grossi (born 1976), guitarist for the rock band Quiet Riot
• Jack Hathaway (born 1982), astronaut, one of the 10 candidates selected as part of NASA Astronaut Group 23
• Romil Hemnani (born 1995), musician, member of hip hop group Brockhampton
• Deborah Dillon Lightfoot (1956–2007), wheelchair athlete; National Wheelchair Basketball Hall of Fame
• Brent Morin (born 1986), actor/comedian (Undateable)
• Paul Pasqualoni (born 1949), former head coach of the University of Connecticut football team
• Jeff Porcaro (1954–1992), member of rock band Toto
• Mike Porcaro (1955–2015), member of rock band Toto
• Steve Porcaro (born 1957), member of rock band Toto
• Brian Sullivan, ice hockey player
• Eli Terry (1772–1852), clockmaker, inventor
• Oliver Wolcott (1726–1797), signer of the Declaration of Independence
• Houman Younessi (1963–2016), scientist

• South Windsor travel guide from Wikivoyage
• Town of South Windsor official website
• South Windsor Historical Society
• South Windsor, Connecticut, at City-Data.com