Henniker is a college town and resort area, featuring both skiing and white-water kayaking.

The main village of the town, where 3,166 people resided at the 2020 census, is defined as the Henniker census-designated place (CDP), and is located along the Contoocook River at the junction of New Hampshire Route 114 with Old Concord Road.

Various mills operated by water power on the Contoocook River, including a woolen factory.

[5] But the mills in Henniker were closed in 1959 by the Hopkinton-Everett Lakes Flood Control Project.

[1] The village of Henniker, or census-designated place (CDP), has a total area of 1.4 square miles (3.6 km2), all land.

The town's southwestern corner is drained by headwaters of Dudley Brook, leading to the Piscataquog River in neighboring Weare.

[8] Craney Hill, elevation 1,402 feet (427 m) above sea level and home of the Pats Peak ski area, is in the south.

The highest point in Henniker is an unnamed summit near the town's northwestern corner, with an elevation of 1,552 ft (473 m).

[11] In the New Hampshire Senate, Henniker is in the 7th District, represented by Republican Daniel Innis.

On the New Hampshire Executive Council, Henniker is in the 2nd District, represented by Democrat Cinde Warmington.