| Official Name: | Alton, New Hampshire |
| Settlement Type: | Census-designated place |
| Pushpin Map: | New Hampshire#USA |
| Pushpin Label: | Alton |
| Pushpin Label Position: | left |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | New Hampshire |
| Subdivision Type2: | County |
| Subdivision Name2: | Belknap |
| Subdivision Type3: | Town |
| Subdivision Name3: | Alton |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 1.30 |
| Area Land Km2: | 1.21 |
| Area Water Km2: | 0.09 |
| Area Total Sq Mi: | 0.50 |
| Area Land Sq Mi: | 0.47 |
| Area Water Sq Mi: | 0.03 |
| Population As Of: | 2020 |
| Population Total: | 499 |
| Population Density Km2: | 411.80 |
| Population Density Sq Mi: | 1066.24 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 562 |
| Coordinates: | 43.4542°N -71.2189°W |
| Postal Code Type: | ZIP Code |
| Postal Code: | 03809 |
| Area Code: | 603 |
| Blank Name: | FIPS code |
| Blank Info: | 33-00980 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2629709 |
Alton is a census-designated place (CDP) and the main village in the town of Alton in Belknap County, New Hampshire, United States. The population was 499 at the 2020 census,[2] compared to 5,894 in the entire town of Alton.
The center of the CDP is at the junction of New Hampshire Routes 11 and 140 in the south-central part of the town of Alton, about south of the southern tip of Lake Winnipesaukee at Alton Bay. The Alton CDP borders include the Merrymeeting River to the south, New Hampshire Route 28 to the east, Wilbert Way and Barr Road to the north, and an unnamed lake along the Merrymeeting River to the west.[3] Route 28 leads north to Wolfeboro and southwest to Pittsfield, Route 11 leads southeast to Rochester and northwest to Laconia, and Route 140 leads west to Gilmanton.
According to the United States Census Bureau, the CDP has a total area of 1.3km2, of which 1.2km2 are land and 0.1sqkm, or 6.77%, are water.[4]
As of the census of 2010, there were 501 people, 227 households, and 125 families residing in the CDP. There were 270 housing units, of which 43, or 15.9%, were vacant. 15 of the vacant units were seasonal or vacation properties. The racial makeup of the CDP was 99.0% white, 0.2% African American, 0.4% Asian, 0.4% from two or more races. 0.8% of the population were Hispanic or Latino of any race.[5]
Of the 227 households in the CDP, 25.6% had children under the age of 18 living with them, 39.6% were headed by married couples living together, 10.6% had a female householder with no husband present, and 44.9% were non-families. 36.1% of all households were made up of individuals, and 16.7% were someone living alone who was 65 years of age or older. The average household size was 2.21, and the average family size was 2.91.[5]
21.2% of residents in the CDP were under the age of 18, 9.4% were from age 18 to 24, 23.0% were from 25 to 44, 27.6% were from 45 to 64, and 19.0% were 65 years of age or older. The median age was 41.6 years. For every 100 females, there were 94.2 males. For every 100 females age 18 and over, there were 83.7 males.[5]