Rocky Hill is a town in Hartford County, Connecticut, United States. The town is part of the Capitol Planning Region. The population was 20,845 at the 2020 census. It was originally land of the Wangunks. Europeans began to settle the area of Rocky Hill in 1650, as part of Wethersfield, the neighboring town to the north. In 1722, the area became known as Stepney Parish, until it was independently incorporated in 1843. Rocky Hill’s location on the Connecticut River made it a natural port for Wethersfield and an early center for shipbuilding, agriculture, and trade.

Hartford County is a county located in the north central part of the U.S. state of Connecticut. According to the 2020 census, the population was 899,498, making it the second-most populous county in Connecticut. Hartford County contains the city of Hartford, the state capital of Connecticut and the county's most populous city, with 121,054 residents at the 2020 census. Hartford County is included in the Hartford-East Hartford-Middletown metropolitan statistical area.