George married December 6, 1837, the stepdaughter of his brother, Loammi Baldwin, Jr., namely, Catherine Richardson Beckford, daughter of Captain Thomas and Catherine (Williams) Beckford, of Charlestown.
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In his fourteenth year he made some sketches of the fortifications of Boston harbor in the war of 1812, of which his brother Loammi Baldwin, Jr. was the chief engineer.
His five sons, Cyrus Baldwin (1773–1854), Benjamin Franklin Baldwin (1777–1821), Loammi Baldwin, Jr. (1780–1834), James Fowle Baldwin (1782–1862), and George Rumford Baldwin (1798–1888) were also well-known engineers.
Baldwin | Alec Baldwin | James Baldwin | Stanley Baldwin | Baldwin Locomotive Works | William Baldwin | James Baldwin (writer) | Baldwin, Nassau County, New York | Daniel Baldwin | Baldwin Spencer | Adam Baldwin | Baldwin Piano Company | Stephen Baldwin | Baldwin II of Jerusalem | Loammi Baldwin, Jr. | James Mark Baldwin | Henry Baldwin Hyde | Baldwin II | Walter Baldwin Spencer | Thomas Scott Baldwin | Monica Baldwin | Michael Baldwin | Burr Baldwin | Baldwin IV of Jerusalem | Baldwin I of Jerusalem | Walter Baldwin | Treat Baldwin Johnson | Tommy Baldwin | Tab Baldwin | Simeon Baldwin |