It is located in the towns of Peterborough and Temple, and is centered on Pack Monadnock, a 2,290-foot (700 m) mountain.

[4] The name Pack comes from an Indian word meaning "little" and is used in comparison to nearby Mount Monadnock.

Pack Monadnock has a paved auto road to the top and is the former site of two hotels.

Until 1901, cattle were driven by foot from Massachusetts farms for summer grazing on open pasture extending nearly to the summit.

The park is named for James Miller, a Peterborough native who was a brigadier general in the United States Army during the War of 1812 and became the first Governor of Arkansas Territory.