It is located in a Richardsonian Romanesque building at 1 South Main Street in the center of the town.

[1] The Flint Public Library is set on the west side of South Main Street (Massachusetts Route 114) in Middleton's town center.

It is a 1-1/2 story brick structure, set on a granite foundation, with a slate hip roof.

Above this is front-facing gable, whose left side is interrupted by a square tower topped by a pyramidal roof.

Middleton native Charles L. Flint in 1879 offered the town funding and a seed collection of books to establish a public library.