The town also includes the communities of Davisville, Lower Village, Melvin Mills, and Waterloo.

Called "New Amesbury", it was part of a line of settlements running between the Merrimack and Connecticut rivers intended to help defend Massachusetts against New France's predations.

[3] Warner developed into a prosperous farming community which produced meats, dairy goods, vegetables, hay and apples.

It leveled houses and forests in a 16-to-18-mile (26 to 29 km) swath of destruction beginning west of Lake Sunapee, through New London and Sutton, over the southwest spur of Mount Kearsarge and ending at the Webster line.

[4] Each October, on Columbus Day weekend, Warner hosts the annual Fall Foliage Festival, attracting thousands of people from all over New England and beyond.

The southwestern section of town is drained by Amey Brook and its tributary, Warner Brook, and the northernmost end of town, on the slopes of Mount Kearsarge, drains both east and west to the Blackwater River.

Mount Kearsarge, elevation 2,937 feet (895 m) above sea level, located in the extreme north of the town, is the highest point in Warner and in Merrimack County.

The peak is the highest point along the 75-mile (121 km) Sunapee-Ragged-Kearsarge Greenway, a hiking trail which links ten towns and encircles the Lake Sunapee region of western New Hampshire.

[7] The Warner Area Farmers' Market, held on Saturday mornings on Main Street, serves as a community gathering place.

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