Town · New Hampshire
Loudon, New Hampshire
Loudon, town, in Merrimack County, New Hampshire. Loudon had 5,781 residents on July 1, 2025 by the Census Bureau's estimate, up 3.5% since 2020; the 2020 Census counted 5,576 and the ACS 2020-2024 5-year estimates put it at 5,692 (±19). GEOID 3301343380.
Residents, July 2025 estimate
5,781
Census Bureau estimate (no margin published)
2020 Census count: 5,576 · ACS 2020-2024: 5,692 ±19
Median household income
$106,966
±$15,836 (90% margin)
New Hampshire: $99,031
Median home value
$363,400
±$47,886 (90% margin)
New Hampshire: $402,500
Median gross rent
$1,321
±$465 (90% margin)
New Hampshire: $1,491
Where is Loudon and what county is it in?
Loudon is a town in Merrimack County, New Hampshire. It covers 46.2 square miles of land, 121 residents per square mile in 2020.
One place lies inside Loudon: Loudon (CDP, 711 in 2020).
Loudon is in the Concord, NH micropolitan statistical area (Census Bureau delineation, July 2023).
Loudon is the same area as Census Tract 360 of Merrimack County: the tract's figures are Loudon's own.
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Loudon, and is it growing?
The Census Bureau estimates that 5,781 people lived in Loudon on July 1, 2025, up 3.5% since 2020, faster than New Hampshire (+2.7%). The 2020 Census counted 5,576 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 5,692 (±19).
| Measure | Loudon | Merrimack County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 5,692±19 | 155,967 | +158 |
| Households | 2,231±146 | 60,901 | no clear change |
| Average household size | 2.55±0.17 | 2.46 | no clear change |
| Housing units | 2,315±171 | 66,497 | no clear change |
Loudon's population since 2000
From 4,481 in 2000 to 5,781 in 2025: up 29.0%. The 2000, 2010 and 2020 figures are census counts, each for Loudon as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Loudon?
The median resident of Loudon is 49.5 years old; 16.8% are under 18 and 22.0% are 65 or older. The largest group is non-Hispanic white residents at 97.7%, then non-Hispanic residents of two or more races at 1.8%.
| Measure | Loudon | Merrimack County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 49.5±3.2 | 42.9 | no clear change |
| Under 18 years | 16.8%±4.1 pts | 18.4% | – |
| 65 years and over | 22.0%±4.0 pts | 19.9% | – |
| Male | 51.5%±3.6 pts | 49.8% | – |
| Hispanic or Latino (any race) | 0.3%±0.6 pts | 2.7% | – |
| White alone, not Hispanic | 97.7%±2.0 pts | 90.1% | no clear change |
| Black or African American alone, not Hispanic | 0.0%±0.6 pts | 1.6% | – |
| Asian alone, not Hispanic | 0.2%±0.4 pts | 1.5% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±0.6 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.6 pts | 0.1% | – |
| Two or more races, not Hispanic | 1.8%±1.6 pts | 3.6% | – |
| Some other race alone, not Hispanic | 0.0%±0.6 pts | 0.4% | – |
| Born outside the United States | 2.3%±1.7 pts | 4.4% | – |
| Speak a language other than English at home (age 5+) | 2.0%±1.6 pts | 5.3% | – |
| Civilian veterans (age 18+) | 10.4%±3.6 pts | 8.1% | – |
| With a disability | 14.5%±4.8 pts | 14.7% | – |
| No health insurance coverage | 5.6%±4.0 pts | 5.1% | – |
| High school graduate or higher (age 25+) | 93.8%±3.5 pts | 94.5% | – |
| Bachelor's degree or higher (age 25+) | 29.3%±6.4 pts | 38.9% | +9.6 pts |
| Graduate or professional degree (age 25+) | 10.2%±3.2 pts | 16.2% | – |
| Lived in the same house a year earlier | 96.2%±3.2 pts | 90.1% | – |
| Moved from another state in the past year | 1.5%±2.2 pts | 2.7% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Loudon earn?
Half of Loudon's 2,231 households earn less than $106,966 a year (±$15,836), against $97,004 in Merrimack County and $99,031 in New Hampshire. In 2015-2019 it was $88,993 in 2024 dollars; the margins of error cannot tell the two periods apart.
| Measure | Loudon | Merrimack County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $106,966±$15,836 | $97,004 | no clear change |
| Mean household income | $111,482±$14,614 | $123,673 | – |
| Per capita income | $44,731±$5,427 | $49,044 | no clear change |
| People below the poverty line | 4.4%±3.3 pts | 7.6% | – |
| Children under 18 below the poverty line | 1.6%±2.8 pts | 7.7% | – |
| Households receiving SNAP | 6.5%±4.9 pts | 7.0% | – |
| Households with a computer | 98.9%±1.2 pts | 96.1% | – |
| Households with a broadband subscription | 96.6%±2.3 pts | 92.8% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Loudon?
Owners occupy 89.6% of Loudon's occupied homes and renters 10.4%. The median owner-occupied home is valued at $363,400 by its owner (±$47,886). The median renter pays $1,321 a month including utilities.
| Measure | Loudon | Merrimack County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $363,400±$47,886 | $367,600 | +$67,418 |
| Median gross rent | $1,321±$465 | $1,360 | no clear change |
| Renters paying 35% or more of income on rent | 32.0%±30.9 pts | 36.6% | – |
| Median monthly owner costs, with a mortgage | $2,160±$155 | $2,324 | – |
| Owner-occupied homes | 89.6%±5.7 pts | 73.5% | no clear change |
| Renter-occupied homes | 10.4%±5.7 pts | 26.5% | – |
| Housing units | 2,315±171 | 66,497 | no clear change |
| Homeowner vacancy rate | 0.0%±1.7 pts | 0.2% | – |
| Rental vacancy rate | 0.0%±14.0 pts | 4.5% | – |
| Single-family detached homes | 73.9%±10.1 pts | 63.1% | – |
| Mobile homes | 18.2%±9.4 pts | 6.8% | – |
| Built 2020 or later | 0.6%±0.9 pts | 1.2% | – |
| Built 2010 to 2019 | 9.9%±4.4 pts | 6.5% | – |
| Built 1939 or earlier | 8.6%±5.6 pts | 24.3% | – |
| Households with no vehicle | 0.0%±1.6 pts | 4.2% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Loudon building?
Builders took permits for 11 new housing units in Loudon in 2025 (11 in single-family houses), 1.9 per 1,000 residents against 3.6 across New Hampshire.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Loudon work and get to work?
81.6% of Loudon's workers drive alone and 8.9% work from home. The average trip to work takes 30.4 minutes.
| Measure | Loudon | Merrimack County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 61.2%±7.4 pts | 64.5% | – |
| Unemployment rate | 1.8%±2.0 pts | 3.1% | – |
| Drove alone to work | 81.6%±6.7 pts | 73.1% | – |
| Carpooled | 4.8%±4.2 pts | 8.2% | – |
| Public transportation | 0.3%±0.5 pts | 0.2% | – |
| Walked | 1.5%±1.5 pts | 2.8% | – |
| Worked from home | 8.9%±4.7 pts | 14.4% | no clear change |
| Mean travel time to work | 30.4 min±4.6 | 26.6 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Loudon?
1 census tract lies mostly in Loudon (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 360Merrimack County | 5,692 | $106,966 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Loudon) · Census block assignment files
How does Loudon compare with other places in New Hampshire?
By the Census Bureau's July 2025 estimates, Loudon is the 2,054th-most populous of the 16,079 U.S. towns and townships that have one and the 52nd-most populous of 221 in New Hampshire.
Loudon ranks 80th of 235 places in New Hampshire with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 52nd | 221 |
| Growth 2020-2025 (PEP) | 59th | 187 |
| Residents per square mile | 158th | 241 |
| Median household income | 80th | 235 |
| Per capita income | 152nd | 240 |
| Median home value | 121st | 239 |
| Median gross rent | 105th | 221 |
| Bachelor's degree or higher | 175th | 239 |
| Median age | 72nd | 239 |
| Owner-occupied share | 66th | 241 |
| Work from home | 194th | 214 |
| Travel time to work | 85th | 241 |
Loudon's figures with every place in New Hampshire (CSV)
Every place in New Hampshire, sortable · Compare Loudon with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Loudon?
23 of the 57 figures for Loudon on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Loudon are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.