| Official Name: | Loudon, New Hampshire |
| Mapsize: | 300px |
| Settlement Type: | Town |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | New Hampshire |
| Subdivision Type2: | County |
| Subdivision Name2: | Merrimack |
| Parts Type: | Villages |
| Leader Title: | Board of Selectmen |
| Leader Title1: | Town Administrator |
| Leader Name1: | Brenda Pearl |
| Established Title: | Incorporated |
| Established Date: | 1773 |
| Area Footnotes: | [1] |
| Area Total Km2: | 121.00 |
| Area Land Km2: | 119.55 |
| Area Water Km2: | 1.45 |
| Area Water Percent: | 1.20 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 5576 |
| Population Density Km2: | 46.6 |
| Timezone: | Eastern |
| Utc Offset: | -5 |
| Timezone Dst: | Eastern |
| Utc Offset Dst: | -4 |
| Coordinates: | 43.2856°N -71.4678°W |
| Elevation M: | 113 |
| Elevation Ft: | 371 |
| Postal Code Type: | ZIP code |
| Postal Code: | 03307 |
| Area Code: | 603 |
| Blank Name: | FIPS code |
| Blank Info: | 33-43380 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0873652 |
Loudon is a town in Merrimack County, New Hampshire, United States. The population was 5,576 at the 2020 census.[2] Loudon is the home of New Hampshire Motor Speedway.
The main village in town, where 711 people lived at the 2020 census, is defined as the Loudon census-designated place and is located along the Soucook River at the southern terminus of New Hampshire Route 129.
The town of Loudon was originally incorporated by Governor John Wentworth on January 23, 1773.[3] Loudon was originally formed of territory taken from Canterbury. The new town was named in honor of John Campbell, 4th Earl of Loudoun, a Scottish soldier and leader of British military forces in North America during the French and Indian War.[4] Loudoun also helped to establish an independent company of colonial militia, called Rogers' Rangers, who were attached to the British Army during the French and Indian War. One of Lord Loudoun's aides, John Loudon McAdam, invented a new process called macadamizing for building roads that were more durable and less muddy than soil-based roads.[5]
According to the United States Census Bureau, the town has a total area of 121km2, of which 119.5sqkm are land and 1.4sqkm are water, comprising 1.45% of the town.[1] The town's highest point is near its northern border, where an unnamed summit just north of the location known as Sabattus Heights reaches 1050feet above sea level.
As of the census of 2010, there were 5,317 people, 1,966 households, and 1,459 families living in the town. There were 2,081 housing units, of which 115, or 5.5%, were vacant. The racial makeup of the town was 98.3% white, 0.3% African American, 0.3% Native American, 0.4% Asian, 0.0% Native Hawaiian or Pacific Islander, 0.1% some other race, and 0.8% from two or more races. 0.8% of the population were Hispanic or Latino of any race.[6]
Of the 1,966 households, 34.3% had children under the age of 18 living with them, 62.0% were headed by married couples living together, 7.8% had a female householder with no husband present, and 25.8% were non-families. 18.6% of all households were made up of individuals, and 6.5% were someone living alone who was 65 years of age or older. The average household size was 2.70, and the average family size was 3.05.[6]
In the town, 23.2% of the population were under the age of 18, 6.8% were from 18 to 24, 24.4% from 25 to 44, 34.3% from 45 to 64, and 11.2% were 65 years of age or older. The median age was 41.9 years. For every 100 females, there were 98.3 males. For every 100 females age 18 and over, there were 94.8 males.[6]
For the period 2011-2015, the estimated median annual income for a household was $65,417, and the median income for a family was $72,266. Male full-time workers had a median income of $57,422 versus $41,201 for females. The per capita income for the town was $30,248. 11.8% of the population and 6.9% of families were below the poverty line. 13.5% of the population under the age of 18 and 3.0% of those 65 or older were living in poverty.[7]
The Loudon Communications Council publishes a monthly newspaper, The Loudon Ledger, that is freely distributed by mail in town, with digital PDF versions published on the Town of Loudon website.[8] As of March 2021, the digital archive has all issues of The Loudon Ledger published from October 2005 onward as well as the July 2005 issue.[8]
Loudon is home to the New Hampshire Motor Speedway, which in the NASCAR Cup Series is home to the Ambetter 301 and formerly the ISM Connect 300, in the NASCAR Xfinity Series the ROXOR 200, formerly in the NASCAR Camping World Truck Series the UNOH 175, in the American Canadian Tour the Bond Auto Invitational, and is also home to the Loudon Classic, known as "America's Oldest Motorcycle Race".