|Loudon, New Hampshire|
LOUDON NEW HAMPSHIRE Latitude and Longitude:
|• Board of Selectmen||Robert N. Fiske, Chair|
|• Total||47.5 sq mi (123.0 km2)|
|• Land||46.8 sq mi (121.2 km2)|
|• Water||0.7 sq mi (1.7 km2) 1.41%|
|Elevation||371 ft (113 m)|
|Time zone||UTC-5 ( Eastern)|
|• Summer ( DST)||UTC-4 ( Eastern)|
|GNIS feature ID||0873652|
The primary settlement in town, where 559 people resided at the 2010 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.  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.  Loudoun also helped to establish an independent company of colonial militia, called Roger's 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. 
According to the United States Census Bureau, the town has a total area of 47.5 square miles (123 km2), of which 46.8 sq mi (121 km2) is land and 0.7 sq mi (1.8 km2) is water, comprising 1.41% of the town. The town's highest point is near its northern border, where an unnamed summit just north of the location known as Sabattus Heights reaches 1,050 feet (320 m) above sea level.
|U.S. Decennial Census |
As of the census of 2010, there were 5,317 people, 1,966 households, and 1,459 families residing 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. 
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. 
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. 
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. 
- The town of Loudon sends children to Loudon Elementary School for kindergarten through 5th grade.
- Children in grades 6, 7, and 8 attend Merrimack Valley Middle School in Penacook.
- Children in grades 9, 10, 11, and 12 attend Merrimack Valley High School in Penacook.
Loudon is home to the New Hampshire Motor Speedway, which in the NASCAR Monster Energy NASCAR Cup Series is home to the Foxwoods Resort Casino 301 and formerly the ISM Connect 300, in the NASCAR Xfinity Series the Lakes Region 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, America's Oldest Motorcycle Race.
- United States Census Bureau, American FactFinder, 2010 Census figures. Retrieved March 23, 2011.
- Hammond, Isaac W. (1883). Documents Relating to Towns in New Hampshire. Retrieved 2011-05-04.
- Gannett, Henry (1905). The Origin of Certain Place Names in the United States. U.S. Government Printing Office. p. 190.
- "Loudon, NH" (PDF). Economic & Labor Market Information Bureau, NH Employment Security. Retrieved 2011-05-04.
- "Annual Estimates of the Resident Population for Incorporated Places: April 1, 2010 to July 1, 2015". Archived from the original on June 2, 2016. Retrieved July 2, 2016.
- "Census of Population and Housing". Census.gov. Retrieved June 4, 2016.
- "Profile of General Population and Housing Characteristics: 2010 Census Summary File 1 (DP-1): Loudon town, Merrimack County, New Hampshire". American Factfinder. U.S. Census Bureau. Retrieved November 3, 2017.
- "Selected Economic Characteristics: 2011-2015 American Community Survey 5-Year Estimates (DP03): Loudon town, Merrimack County, New Hampshire". American Factfinder. U.S. Census Bureau. Retrieved November 3, 2017.