Coos County, New Hampshire Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 10th-largest in New Hampshire
The population of Coos County, New Hampshire is 31,386 as of the 2023 American Community Survey, making it the 10th-largest county in New Hampshire. The median household income is $58,439, the median home value is $169,600, and the median age is 49.9.
The population of Coos County has declined 5.7% since 2010 (32,970 → 31,094), a -0.42% annualized rate.
31,386
Population
-0.42%
Annual growth
17
People / sq mi
$58,439
Median Income
$169,600
Median Home Value
Coos County covers 1,795 sq mi of land at 17.5 people per square mile.
About Coos County, NH
Age is the most distinctive thing about Coos County: a median age of 49.9, older than the national median. With 31,386 residents, Coos County is a county in New Hampshire. That makes it one of the ten largest counties in New Hampshire in the country, at #10 by population.
The typical household here earns about $58,439, below the US median of $78,538. About 8.7% of residents live below the federal poverty level, below the national 12.4%. Homes carry a median value of $169,600, with typical rent around $843.
Roughly 20.2% of adults have a bachelor’s, below the national 35.0%. Remote work is below the national 14.0% at 8.2%, and the average commute runs about 23 minutes each way.
The age structure shapes everything downstream in Coos County — from housing demand to the mix of working-age earners reflected in the income figures above.
Coos County Population History (2010-2024)
The county of Coos County had a population of 32,970 in 2010 and 31,094 in 2024, a -5.7% growth over 14 years. The peak was 32,970 in 2010. Average annual growth rate: -0.41%.
31,094
Population (2024)
32,970
Population (2010)
32,970
Peak (2010)
-0.41%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 32,970 |
| 2011 | 32,512 |
| 2012 | 31,980 |
| 2013 | 31,952 |
| 2014 | 32,787 |
| 2015 | 32,351 |
| 2016 | 31,923 |
| 2017 | 31,418 |
| 2018 | 31,490 |
| 2019 | 31,421 |
| 2020 | 31,228 |
| 2021 | 31,387 |
| 2022 | 31,430 |
| 2023 | 31,209 |
| 2024 | 31,094 |
Race & Ethnicity
| White | 94.3% |
| Black or African American | 1.7% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.3% |
| Two or More Races | 0.0% |
Age & Sex
49.9
Median Age
47.1%
Female
52.9%
Male
25.2%
Age 65+
Age Distribution
Children (under 15): 12.9% · Seniors (65+): 25.2%
Income & Poverty
| Median household income | $58,439$-37,189 vs state |
| Mean household income | $82,759 |
| Per-capita income | $36,850 |
| Poverty rate | 8.7%+4.3% vs state |
| Unemployment rate | 2.3% |
| Employment-to-population | 52.4% |
Top Industries by Employment
The largest employment sector in Coos County is professional & business services, accounting for 24.3% of workers.
How residents commute
0.1%
Drive alone
2.7%
Carpool
76.7%
Public transit
8.2%
Work from home
22.8 min
Avg commute
Housing
$169,600$-197,600 vs state
Median home value
$843
Median rent
74.0%
Homeownership rate
20,589
Total housing units
67.1%
Occupied
32.9%
Vacant
26.0%
Renter-occupied
Social & access
93.0%
With health insurance
92.3%
With broadband internet
40.9%
Foreign-born
10.2%
Veterans (18+)
21.0%
With a disability
92.1%
Speak language other than English at home
Education
89.5%
High School+
20.2%
Bachelor's+
Largest cities in New Hampshire
Other counties in New Hampshire
Part of New Hampshire
Metro areas in New Hampshire
County rankings
Frequently Asked Questions
Coos County, New Hampshire has a population of 31,386 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 10th-largest county in New Hampshire. Population density is 17 people per square mile.
The population of Coos County has declined 5.7% since 2010 (32,970 → 31,094), a -0.42% annualized rate.
The median household income in Coos County, New Hampshire is $58,439, with mean (average) household income of $82,759 and per-capita income of $36,850. 8.7% of residents live below the federal poverty level.
In Coos County, the largest racial and ethnic groups are White (94.3%), Black or African American (1.7%), Hispanic or Latino (1.3%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Coos County, New Hampshire is 49.9 years. Residents are 47.1% female and 52.9% male.
The median home value in Coos County is $169,600 and median monthly rent is $843. 74.0% of occupied housing units are owner-occupied. The county has 20,589 total housing units, 32.9% of which are vacant.
The largest employment sector in Coos County, New Hampshire is professional, scientific, and management services, employing 24.3% of workers. The unemployment rate is 2.3%.
Manchester is among the largest cities associated with Coos County, New Hampshire, with a population of 115,415.
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Statewide data for New Hampshire
Population, race, income, age, and trends across New Hampshire
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.