Trumbull is a town located in Fairfield County, Connecticut, United States. The town is part of the Greater Bridgeport Planning Region, and borders on the cities of Bridgeport and Shelton, as well as the towns of Stratford, Fairfield, Easton and Monroe. The population was 36,827 during the 2020 census. Trumbull was the home of the Golden Hill Paugussett Indian Nation for thousands of years before the English settlement was made in 1639. The town was named after Jonathan Trumbull (1710–1785), a merchant, patriot and statesman, at its incorporation in 1797. Aviation pioneer Igor Sikorsky lived in Trumbull during his active years when he designed, built, and flew fixed-wing aircraft and put the helicopter into mass production for the first time.

Fairfield County is a county in the southwestern corner of the U.S. state of Connecticut. It is the most populous county in the state and was also its fastest-growing from 2010 to 2020. As of the 2020 census, the county's population was 957,419, representing 26.6% of Connecticut's overall population. The closest to the center of the New York metropolitan area, the county contains four of the state's top 7 largest cities—Bridgeport (1st), Stamford (2nd), Norwalk (6th), and Danbury (7th)—whose combined population of 433,368 is nearly half the county's total population.