Sullivan is a town in Cheshire County, New Hampshire, United States.

[3] In 1867, Sullivan was the first town in New Hampshire to dedicate a monument to its soldiers lost in the Civil War.

The highest point in Sullivan is the summit of Boynton Hill at 1,739 feet (530 m), in the northern part of town.

19.1% of all households were made up of individuals, and 5.0% had someone living alone who was 65 years of age or older.

From 1960 to 2013, Sullivan had been a member of the cooperative Monadnock Regional School District.

At the March 2012 annual town meeting, residents of Sullivan voted to begin the process of withdrawing from the cooperative school district.

[7] On July 1, 2013, the town began operating its own independent school district.