Sullivan County, New Hampshire Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 9th-largest in New Hampshire
The population of Sullivan County, New Hampshire is 43,529 as of the 2023 American Community Survey, making it the 9th-largest county in New Hampshire. The median household income is $75,929, the median home value is $236,300, and the median age is 47.3.
The population of Sullivan County has grown 0.6% since 2010 (43,744 → 44,012), a +0.04% annualized rate.
43,529
Population
+0.04%
Annual growth
81
People / sq mi
$75,929
Median Income
$236,300
Median Home Value
Sullivan County covers 538 sq mi of land at 80.9 people per square mile.
About Sullivan County, NH
Sullivan County is distinguished by its share of foreign-born residents, 43.7% of the population. With 43,529 residents, Sullivan County is a county in New Hampshire. That makes it one of the ten largest counties in New Hampshire in the country, at #9 by population.
Households take in a median $75,929, comfortably near the US median of $78,538. Poverty is relatively low for US counties at 7.0%, below the national 12.4%. The median home value is $236,300, with typical rent around $1,159.
Educational attainment is on the higher side for US counties — 30.5% of adults hold a four-year degree, below the national 35.0%. Remote work is below the national 14.0% at 9.6%, and the average commute runs about 26 minutes each way.
The large foreign-born share is a defining thread in Sullivan County, shaping language, household composition, and the labor force behind the economic figures above.
Sullivan County Population History (2010-2024)
The county of Sullivan County had a population of 43,744 in 2010 and 44,012 in 2024, a 0.6% growth over 14 years. The peak was 44,012 in 2024. Average annual growth rate: 0.04%.
44,012
Population (2024)
43,744
Population (2010)
44,012
Peak (2024)
0.04%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 43,744 |
| 2011 | 43,509 |
| 2012 | 43,240 |
| 2013 | 43,069 |
| 2014 | 43,177 |
| 2015 | 43,175 |
| 2016 | 43,088 |
| 2017 | 43,053 |
| 2018 | 43,194 |
| 2019 | 43,263 |
| 2020 | 43,069 |
| 2021 | 43,609 |
| 2022 | 43,881 |
| 2023 | 44,006 |
| 2024 | 44,012 |
Race & Ethnicity
| White | 92.3% |
| Black or African American | 0.9% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.4% |
| Two or More Races | 0.0% |
Age & Sex
47.3
Median Age
49.8%
Female
50.2%
Male
23.1%
Age 65+
Age Distribution
Children (under 15): 14.7% · Seniors (65+): 23.1%
Income & Poverty
| Median household income | $75,929$-19,699 vs state |
| Mean household income | $102,029 |
| Per-capita income | $41,921 |
| Poverty rate | 7.0%+2.6% vs state |
| Unemployment rate | 1.3% |
| Employment-to-population | 56.7% |
Top Industries by Employment
The largest employment sector in Sullivan County is professional & business services, accounting for 28.7% of workers.
How residents commute
0.1%
Drive alone
2.4%
Carpool
77.5%
Public transit
9.6%
Work from home
25.9 min
Avg commute
Housing
$236,300$-130,900 vs state
Median home value
$1,159
Median rent
74.8%
Homeownership rate
21,905
Total housing units
73.4%
Occupied
26.6%
Vacant
25.2%
Renter-occupied
Social & access
93.6%
With health insurance
92.7%
With broadband internet
43.7%
Foreign-born
9.3%
Veterans (18+)
14.7%
With a disability
97.6%
Speak language other than English at home
Education
91.1%
High School+
30.5%
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
Sullivan County, New Hampshire has a population of 43,529 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 9th-largest county in New Hampshire. Population density is 81 people per square mile.
The population of Sullivan County has grown 0.6% since 2010 (43,744 → 44,012), a +0.04% annualized rate.
The median household income in Sullivan County, New Hampshire is $75,929, with mean (average) household income of $102,029 and per-capita income of $41,921. 7.0% of residents live below the federal poverty level.
In Sullivan County, the largest racial and ethnic groups are White (92.3%), Hispanic or Latino (1.4%), Black or African American (0.9%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Sullivan County, New Hampshire is 47.3 years. Residents are 49.8% female and 50.2% male.
The median home value in Sullivan County is $236,300 and median monthly rent is $1,159. 74.8% of occupied housing units are owner-occupied. The county has 21,905 total housing units, 26.6% of which are vacant.
The largest employment sector in Sullivan County, New Hampshire is professional, scientific, and management services, employing 28.7% of workers. The unemployment rate is 1.3%.
Manchester is among the largest cities associated with Sullivan County, New Hampshire, with a population of 115,415.
Sullivan County, NH Climate
Sullivan County, NH has an average annual temperature of 6.7°C (44°F) and receives about 1035 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
6.7°C
Avg Temp
1035
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -7° / 19° | 71 mm |
| February | -6° / 21° | 70 mm |
| March | -1° / 31° | 76 mm |
| April | 6° / 42° | 85 mm |
| May | 13° / 55° | 96 mm |
| June | 17° / 63° | 90 mm |
| July | 20° / 68° | 93 mm |
| August | 19° / 66° | 99 mm |
| September | 14° / 58° | 83 mm |
| October | 8° / 47° | 89 mm |
| November | 2° / 36° | 96 mm |
| December | -4° / 24° | 87 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Sullivan County, NH
The most comfortable months to visit Sullivan County, NH are typically July, August and June, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 27°C high). The coldest is January (near -13°C low). August is usually the wettest month.
Where to stay near Sullivan County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.