With 31,271 people, Coos County is a county in New Hampshire. The median age is 50.3, about 11 years above the US median. Four-year degrees are less common here than nationally, at 20% of adults. Households here earn about 42% less than in New Hampshire as a whole. There are 17 people per square mile. The foreign-born share is 3%.
At a glance
Lower income
median household income $57,677, below the US median
US median: $82,259
Older
median age 50.3
US median: 38.9
Less educated
20% hold a bachelor's degree
US average: 36%
Less affordable
home values up 50%, inflation adjusted
US median home: $376,019
Unique to this place
What stands out about Coos County
What changed most since 1990
Median age36.3 → 50.3(+14.0 years)US over the same years: +6.0 years
White share99.0% → 91.9%(−7.1 pts)US over the same years: −17.8 pts
Population34,828 → 31,271(−10%)US over the same years: +35%
Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.
Section 09 · Service history
Veterans
Veterans by period of service, 2024
Gulf War (2001 or later)20.4%(551)
US avg: 26.4%
Gulf War (1990s)21.4%(579)
US avg: 24.3%
Vietnam era37.6%(1,017)
US avg: 33.1%
Korean War4.5%(121)
US avg: 4.5%
World War II0.4%(11)
US avg: 1%
Share of the 2,707 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Over time
Coos County, decade by decade
Coos County population, inflation-adjusted income and home value, education, and diversity by year
Year
Population
Median household income
Median home value
Bachelor's degree+
Diversity score
1990
34,828
$62,155
$172,565
11.0%
2.5
2000
33,111
$61,195
$126,241
11.9%
5.7
2010
33,055
$59,750
$189,028
16.1%
9.3
2020
31,268
$59,323
$160,595
19.7%
20.1
2024
31,271
$57,677
$188,900
20.1%
19.1
Census years come from the decennial census and the latest year from the American Community Survey, so part of any change between those two rows can reflect the different surveys. Dollar figures are adjusted for inflation to 2024 dollars; a figure ending in "+" was at the Census Bureau's reporting cap that year. The diversity score runs from 0 to 100; see how it's calculated.
