South Windsor owes its location to the Connecticut River, whose periodic floods created fertile lowlands that nourished livestock and crops. Tobacco became a mainstay of South Windsor's agricultural life in the early to mid-19th centuries, with mills on the Scantic and Podunk Rivers, tributaries of the Connecticut. Well into the 20th century, South Windor's children still attended some of the one- and two-room schoolhouses around town until the post-World War II baby boom and influx of new residents necessitated new buildings.

Thomas Welles (ca. 1590-1660), son of Robert and Alice Welles, was born in Stourton, Whichford, Warwickshire, England, and died in Wethersfield, Connecticut. He married (1) Alice Tomes (b. before 1593), daughter of John Tomes and Ellen (Gunne) Phelps, 1615 in Long Marston, Gloucestershire. She was born in Long Marston, and died before 1646 in Hartford, Connecticut. They had eight children. He married (2) Elizabeth (Deming) Foote (ca. 1595-1683) ca. 1646. She was the widow of Nathaniel Foote and the sister of John Deming. She had seven children from her previous marriage.

Thomas Welles (ca. 1590-1660), son of Robert and Alice Welles, was born in Stourton, Whichford, Warwickshire, England, and died in Wethersfield, Connecticut. He married (1) Alice Tomes (b. before 1593), daughter of John Tomes and Ellen (Gunne) Phelps, 1615 in Long Marston, Gloucestershire. She was born in Long Marston, and died before 1646 in Hartford, Connecticut. They had eight children. He married (2) Elizabeth (Deming) Foote (ca. 1595-1683) ca. 1646. She was the widow of Nathaniel Foote and the sister of John Deming. She had seven children from her previous marriage.