[1] The area that is now Somers was settled in the 17th century as part of Agawam Plantation (now Springfield, Massachusetts).

It was separately incorporated out of Enfield in 1734, with jurisdiction transferred to the Connecticut Colony in 1749.

The town has been primarily agricultural for much of its history, although there was a mill village at Somersville.

The town center, located at the junction Main Street (Connecticut Route 190) with Springfield and South Streets (Connecticut Route 83), has been its civic and social center throughout.

The older properties are largely clustered in three places: on Springfield Road near Main, the eastern end of Main Street, and the area just west of where the modern (1950) town hall stands.