Keene is the only city in and the seat of Cheshire County, New Hampshire, United States. The population was 23,409 at the 2010 census.
Keene is located at 42°56′01″N 72°16′41″W / 42.93361°N 72.27806°W / 42.93361; -72.27806 (42.9339, −72.2784).
According to the United States Census Bureau, the city has a total area of 37.5 square miles (97.1 km). 37.3 square miles (96.5 km) of it is land and 0.3 square miles (0.7 km) of it is water, comprising 0.67% of the town. Keene is drained by the Ashuelot River. The highest point in Keene is the summit of Grays Hill in the city’s northwest corner, at 1,388 feet (423 m) above sea level. Keene is entirely within the Connecticut River watershed, with all of the city except for the northwest corner draining to the Connecticut via the Ashuelot.
State highways converge on Keene from nine directions. New Hampshire Route 9 leads northeast to Concord, the state capital, and west to Brattleboro, Vermont. Route 10 leads north to Newport and southwest to Northfield, Massachusetts. Route 12 leads northwest to Walpole and Charlestown and southeast to Winchendon, Massachusetts. Route 101 leads east to Peterborough and Manchester, Route 32 leads south to Swanzey, New Hampshire, and to Athol, Massachusetts, and Route 12A leads north to Surry and Alstead. A limited-access bypass used variously by Routes 9, 10, 12, and 101 passes around the north, west, and south sides of downtown.
Keene is served by Dillant–Hopkins Airport, located just south of the city in Swanzey.
As of the census of 2010, there were 23,409 people, 9,052 households, and 4,843 families residing in the city. The population density was 627.6 people per square mile (242.3/km²). There were 9,719 housing units at an average density of 260.6 per square mile (100.6/km²). The racial makeup of the city was 95.3% White, 0.6% African American, 0.2% Native American, 2.0% Asian, 0.004% Native Hawaiian or other Pacific Islander, 0.5% some other race, and 1.4% from two or more races. Hispanic or Latino of any race were 1.6% of the population.
There were 9,052 households, out of which 23.0% had children under the age of 18 living with them, 39.1% were headed by married couples living together, 10.6% had a female householder with no husband present, and 46.5% were non-families. 31.8% of all households were made up of individuals, and 12.6% consisted of someone living alone who was 65 years of age or older. The average household size was 2.26, and the average family size was 2.83.
In the city, the population was spread out with 16.6% under the age of 18, 24.1% from 18 to 24, 20.6% from 25 to 44, 24.0% from 45 to 64, and 14.7% who were 65 years of age or older. The median age was 34.0 years. For every 100 females, there were 88.3 males. For every 100 females age 18 and over, there were 85.8 males.
For the period 2010 through 2014, the estimated median income for a household in the city was $52,327, and the median income for a family was $75,057. Male full-time workers had a median income of $50,025 versus $39,818 for females. The per capita income for the city was $29,366. About 6.7% of families and 16.5% of the population were below the poverty line, including 16.5% of those under age 18 and 11.5% of those age 65 or over.
Keene New Hampshire neighborhoods include: Beaver St, Drummer Hill, Emerald, Evergreen, Franklin Pierce Hwy, High/Cross/Union, Maple Ave, Tanglewood Estates