Hadley was first settled in 1659 and was officially incorporated in 1661. The former Norwottuck was renamed for Hadleigh, Suffolk. Its settlers were primarily a discontented group of families from the Puritan colonies of Hartford and Wethersfield, Connecticut, who petitioned to start a new colony up north after some controversy over doctrine in the local church. The settlement was led by John Russell. The first settler inside of Hadley was Nathaniel Dickinson, who surveyed the streets of what is now Hadley, Hatfield, and Amherst. At the time, Hadley encompassed a wide radius of land on both sides of the Connecticut River (but mostly on the eastern shore) including much of what would become known as the Equivalent Lands. In the following century, these were broken off into precincts and eventually the separate towns of Hatfield, Amherst, South Hadley, Granby and Belchertown. The early histories of these towns are, as a result, filed under the history of Hadley.

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