County · New Hampshire

Sullivan County, New Hampshire

Sullivan County, New Hampshire. Sullivan County had 43,961 residents in 2025 by the Census Bureau's estimate, up 2.1% since 2020, slower than New Hampshire (+2.7%). It holds 18 places (1 city, village or borough, 14 towns and townships and 3 census-designated) and 11 census tracts. GEOID 33019.

Sullivan County is one of the 4 counties of the Lebanon-Claremont, NH-VT micropolitan statistical area (the Census Bureau's July 2023 delineation).

Residents, July 2025 estimate

43,961

Census Bureau estimate (no margin published)
2020 Census count: 43,063 · ACS 2020-2024: 43,715

Median household income

$80,858

±$3,824 (90% margin)
New Hampshire: $99,031

Median home value

$268,700

±$9,374 (90% margin)
New Hampshire: $402,500

Median gross rent

$1,211

±$60 (90% margin)
New Hampshire: $1,491

How many people live in Sullivan County, and is it growing?

The 2020 Census counted 43,063 residents in Sullivan County. The Census Bureau estimates 43,961 for July 1, 2025, up 2.1% since 2020, slower than New Hampshire (+2.7%). The 2020-2024 American Community Survey puts the population at 43,715 over 538 square miles of land.

July 2020→2021 +546 (43,619)
2021→2022 +270 (43,889)
2022→2023 +119 (44,008)
2023→2024 −84 (43,924)
2024→2025 +37 (43,961)

Sullivan County in New Hampshire. Boundaries: Census Bureau 2024.

Counts, ACS 2020-2024 5-year estimates, with the change from 2015-2019
Measure	Sullivan County	New Hampshire	Change since 2015-2019
Total population	43,715	1,394,868	+611
Households	16,618±461	555,822	−710
Average household size	2.59±0.07	2.44	+0.15
Housing units	21,958±104	648,472	−694

Sullivan County's population since 2000

From 40,458 in 2000 to 43,961 in 2025: up 8.7%. The 2000, 2010 and 2020 figures are census counts. 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.

2000 Census 40,458
2005 (estimate) 42,913
2010 Census 43,742
2015 (estimate) 43,175
2020 Census 43,063
2025 (estimate) 43,961

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); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov

What cities and towns are in Sullivan County?

Sullivan County holds 18 places: 1 city, village or borough (an incorporated place), 14 towns and townships (county subdivisions with their own government) and 3 census-designated places. The largest is Claremont with 13,032 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.

Places in Sullivan County, ACS 2020-2024 5-year estimates. Ring: estimate with a coefficient of variation over 40%.

Claremont	city	12,949	13,078±21	$59,096	$204,600	13.5%	100%
Newport	town	6,299	6,375±17	$80,341	$225,900	11.8%	100%
Charlestown	town	4,806	4,889±27	$47,338	$228,000	14.8%	100%
Newport CDP	CDP	4,735	4,758±467	$78,174	$211,200	14.8%	100%
GranthamGEOID 3301931220	town	3,404	3,465±22	$106,403	$343,100	0.0%	100%
Sunapee	town	3,342	3,416±27	$101,393	$393,000	12.4%	100%
Plainfield	town	2,459	2,522±21	$122,656	$442,400	5.2%	100%
Cornish	town	1,616	1,816±264	$91,821	$296,000	4.7%	100%
Unity	town	1,518	1,375±168	$87,500	$276,100	6.3%	100%
Springfield	town	1,259	1,122±356	$100,893	$384,100	3.4%	100%
Washington	town	1,192	1,208±184	$89,453	$358,600	8.7%	100%
Lempster	town	1,118	953±182	$86,607	$241,900	7.2%	100%
Charlestown CDPGEOID 3311300	CDP	1,078	659±288	$31,078	$119,800	46.6%	100%
Acworth	town	853	851±255	$82,917	$273,000	9.3%	100%
Croydon	town	801	798±155	$98,333	$317,300	6.4%	100%
Goshen	town	796	1,042±275	$70,417	$255,600	5.5%	100%
Langdon	town	651	805±165	$97,917	$281,900	4.6%	100%
Plainfield CDPGEOID 3362260	CDP	178	220±99	$109,500	$455,600	0.0%	100%

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov

Who lives in Sullivan County?

The median resident of Sullivan County is 47.0 years old; 17.7% are under 18 and 23.5% are 65 or older. The largest group is non-Hispanic white residents at 91.4%, then non-Hispanic residents of two or more races at 5.1%. 2.1% of residents were born outside the United States.

Age, origin and education, ACS 2020-2024 5-year estimates. Race groups are non-Hispanic; Hispanic includes any race.
Measure	Sullivan County	New Hampshire	Change since 2015-2019
Median age	47.0±0.5	43.3	+0.7
Under 18 years	17.7%±0.1 pts	18.2%	–
65 years and over	23.5%±0.3 pts	20.1%	–
Hispanic or Latino (any race)	2.1%	4.7%	+0.5 pts
White alone, not Hispanic	91.4%±0.8 pts	86.9%	−3.6 pts
Black or African American alone, not Hispanic	0.7%±0.2 pts	1.3%	no clear change
Asian alone, not Hispanic	0.3%±0.2 pts	2.6%	–
American Indian and Alaska Native alone, not Hispanic	0.0%±0.1 pts	0.1%	–
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0.0%±0.1 pts	0.0%	–
Two or more races, not Hispanic	5.1%±0.8 pts	4.0%	–
Some other race alone, not Hispanic	0.3%±0.3 pts	0.4%	–
Born outside the United States	2.1%±0.6 pts	6.1%	−0.8 pts
Speak a language other than English at home (age 5+)	1.8%±0.6 pts	7.9%	–
Civilian veterans (age 18+)	10.1%±1.2 pts	7.6%	–
With a disability	16.5%±1.5 pts	13.3%	–
No health insurance coverage	6.0%±1.1 pts	5.3%	no clear change
High school graduate or higher (age 25+)	92.1%±1.4 pts	94.4%	–
Bachelor's degree or higher (age 25+)	30.3%±2.3 pts	40.6%	no clear change
Graduate or professional degree (age 25+)	11.5%±1.4 pts	16.1%	–
Moved from another state in the past year	2.2%±0.7 pts	3.6%	–

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 Sullivan County earn?

Half of Sullivan County's 16,618 households earn less than $80,858 a year (±$3,824), against $99,031 in New Hampshire. In 2015-2019 it was $75,456 in 2024 dollars; the margins of error cannot tell the two periods apart. 10.1% of residents live below the poverty line.

Income and poverty in 2024 dollars, ACS 2020-2024 5-year estimates
Measure	Sullivan County	New Hampshire	Change since 2015-2019
Median household income	$80,858±$3,824	$99,031	no clear change
Mean household income	$105,975±$7,849	$128,322	–
Per capita income	$44,514±$3,173	$52,798	+$3,849
People below the poverty line	10.1%±1.6 pts	7.2%	no clear change
Children under 18 below the poverty line	12.1%±3.6 pts	7.9%	no clear change
Households receiving SNAP	8.3%±1.4 pts	6.1%	–
Households with a broadband subscription	87.1%±2.0 pts	92.9%	–

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 Sullivan County?

Owners occupy 75.4% of Sullivan County's occupied homes and renters 24.6%. The median owner-occupied home is valued at $268,700 by its owner (±$9,374). The median renter pays $1,211 a month including utilities, and 43.3% of renters pay 35% or more of their income on rent.

Housing, ACS 2020-2024 5-year estimates
Measure	Sullivan County	New Hampshire	Change since 2015-2019
Median home value (owner-occupied)	$268,700±$9,374	$402,500	+$55,052
Median gross rent	$1,211±$60	$1,491	no clear change
Renters paying 35% or more of income on rent	43.3%±6.5 pts	38.4%	no clear change
Median monthly owner costs, with a mortgage	$1,904±$85	$2,367	–
Owner-occupied homes	75.4%±2.5 pts	72.8%	no clear change
Housing units	21,958±104	648,472	−694
Homeowner vacancy rate	0.7%±0.7 pts	0.4%	–
Rental vacancy rate	6.1%±4.0 pts	4.0%	–
Single-family detached homes	73.9%±2.2 pts	63.3%	–
Mobile homes	7.7%±1.3 pts	5.2%	–
Built 2020 or later	0.9%±0.3 pts	1.3%	–
Built 1939 or earlier	23.7%±2.2 pts	18.6%	–

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 Sullivan County building?

Builders took permits for 133 new housing units across Sullivan County in 2025 (129 single-family), 3.0 per 1,000 residents.

2019 55 units
2020 76 units
2021 82 units
2022 105 units
2023 97 units
2024 100 units
2025 133 units

Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey

How do people in Sullivan County get to work?

77.2% of Sullivan County's workers drive alone and 10.2% work from home. The average trip to work takes 26.1 minutes. The unemployment rate in 2020-2024 averaged 3.1%.

Work and commuting, ACS 2020-2024 5-year estimates
Measure	Sullivan County	New Hampshire	Change since 2015-2019
In the labor force (age 16+)	59.9%±2.0 pts	66.3%	–
Unemployment rate	3.1%±0.9 pts	3.3%	no clear change
Drove alone to work	77.2%±2.4 pts	72.0%	–
Carpooled	8.4%±1.7 pts	7.0%	–
Public transportation	0.1%±0.1 pts	0.5%	–
Walked	2.3%±0.9 pts	2.3%	–
Worked from home	10.2%±1.4 pts	16.8%	+5.3 pts
Mean travel time to work	26.1 min±1.3	26.7 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 are Sullivan County's census tracts?

Sullivan County is divided into 11 census tracts. Among those with a reliable estimate, median household income runs from $47,338 (Tract 9757) to $105,699 (Tract 9752).

Census tracts of Sullivan County, ACS 2020-2024 5-year estimates; sort by any column

Tract 975133019975100	Plainfield (3%)	4,075	4,338±264	$103,317	$375,200	$1,595	5.0%
Tract 975233019975200	–	5,464	5,385±387	$105,699	$345,500	$1,063	1.7%
Tract 975333019975300	–	3,342	3,416±27	$101,393	$393,000	$1,713	12.4%
Tract 9754.0133019975401	Newport (72%)	3,030	3,276±371	$79,935	$221,200	$1,339	12.1%
Tract 9754.0233019975402	Newport (51%)	3,269	3,099±373	$85,750	$234,500	$1,556	11.5%
Tract 975533019975500	–	3,106	3,203±308	$86,650	$302,600	$1,228	7.3%
Tract 975633019975600	–	3,022	3,031±332	$85,104	$277,500	$1,397	6.7%
Tract 975733019975700	Charlestown (19%)	4,806	4,889±27	$47,338	$228,000	$1,099	14.8%
Tract 975833019975800	Claremont	4,705	4,849±469	$67,436	$209,600	$1,268	11.5%
Tract 9759.0133019975901	Claremont	4,438	3,972±359	$50,901	$222,400	$1,234	12.5%
Tract 9759.0233019975902	Claremont	3,806	4,257±482	$56,975	$168,100	$1,039	16.8%

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov

How does Sullivan County compare with New Hampshire's other counties?

Sullivan County's rank among New Hampshire's counties with a reliable estimate (1 = highest)
Measure	Rank
Population	9th of 10
Growth 2020-2025	9th of 10
Residents per square mile	7th of 10
Median household income	9th of 10
Median home value	9th of 10
Median gross rent	7th of 10
Poverty rate	3rd of 10
Bachelor's degree or higher	9th of 10
Median age	4th of 10

Every county in New Hampshire

Source: PlainCities ranks 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 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 Sullivan County 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.