Sullivan County Demographics

A map of Sullivan County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	39,974	39,123	91.4%	90.9%
Multiracial	2,217	2,209	5.1%	5.1%
Hispanic	911	822	2.1%	1.9%
Black	309	185	0.7%	0.4%
Native American/Other	179	321	0.4%	0.7%
Asian	125	403	0.3%	0.9%

Sullivan County, New Hampshire has an estimated population of 43,715, a slight increase from the 43,063 recorded in the 2020 Census. The population is 91.4% White, 5.1% Multiracial, 2.1% Hispanic, 0.7% Black, 0.4% Native American/Other, and 0.3% Asian. This demographic dot map shows the population of Sullivan County, with one dot drawn for each person counted by the Census, color-coded by race.

Sullivan has become less racially diverse since the 2020 Census. It is considerably less diverse than New Hampshire overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Sullivan County, that probability was 17.2% in 2020 and 16.1% in the most recent ACS estimates.

Sullivan County is ranked the 9th most populous county in New Hampshire, out of 10 counties. Sullivan County was ranked the 9th most populous county in the 2020 Census.

Sullivan County's White Population

39,974 residents of Sullivan County, or 91.4% of the population, identify as White. The share of White residents in Sullivan County is slightly higher than in New Hampshire overall, where 86.9% of the population is White. Sullivan County ranks 4th statewide in terms of White residents as a share of the population, out of 10 counties.

Since the 2020 Census, Sullivan County's White population has grown by an estimated 2.2%. White residents' share of Sullivan County's population has increased from 90.9% to 91.4%.

Sullivan County is more White than neighboring Merrimack County (90.1% White), and Windham County (90.1% White). Sullivan County is less White than neighboring Windsor County (92.1% White), and Orange County (92.8% White).

Sullivan County's Black Population

309 residents of Sullivan County, or 0.7% of the population, identify as Black. The share of Black residents in Sullivan County is comparable to the share in New Hampshire overall, where 1.3% of the population is Black. Sullivan County ranks 9th statewide in terms of Black residents as a share of the population, out of 10 counties.

Since the 2020 Census, Sullivan County's Black population has grown by an estimated 67.0%. Black residents' share of Sullivan County's population has remained roughly unchanged at 0.7%.

Sullivan County is more Black than neighboring Windsor County (0.5% Black), and Orange County (0.3% Black). Sullivan County is less Black than neighboring Merrimack County (1.6% Black), and Windham County (0.8% Black).

Sullivan County's Asian Population

125 residents of Sullivan County, or 0.3% of the population, identify as Asian. The share of Asian residents in Sullivan County is slightly lower than in New Hampshire overall, where 2.6% of the population is Asian. Sullivan County ranks 7th statewide in terms of Asian residents as a share of the population, out of 10 counties.

Since the 2020 Census, Sullivan County's Asian population has declined by an estimated 69.0%. Asian residents' share of Sullivan County's population has decreased from 0.9% to 0.3%.

Sullivan County is less Asian than neighboring Windsor County (1% Asian), Cheshire County (0.9% Asian), Merrimack County (1.5% Asian), Windham County (1.2% Asian), and Orange County (0.6% Asian).

Sullivan County's Hispanic Population

911 residents of Sullivan County, or 2.1% of the population, identify as Hispanic. The share of Hispanic residents in Sullivan County is slightly lower than in New Hampshire overall, where 4.7% of the population is Hispanic. Sullivan County ranks 9th statewide in terms of Hispanic residents as a share of the population, out of 10 counties.

Since the 2020 Census, Sullivan County's Hispanic population has grown by an estimated 10.8%. Hispanic residents' share of Sullivan County's population has remained roughly unchanged at 2.1%.

Sullivan County is more Hispanic than neighboring Orange County (1.8% Hispanic). Sullivan County is less Hispanic than neighboring Windsor County (2.3% Hispanic), Cheshire County (2.6% Hispanic), Merrimack County (2.7% Hispanic), and Windham County (3.1% Hispanic).

Sullivan County's Native American/Other Population

179 residents of Sullivan County, or 0.4% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Sullivan County is comparable to the share in New Hampshire overall, where 0.5% of the population is Native American/Other. Sullivan County ranks 1st statewide in terms of Native American/Other residents as a share of the population, out of 10 counties.

Since the 2020 Census, Sullivan County's Native American/Other population has declined by an estimated 44.2%. Native American/Other residents' share of Sullivan County's population has remained roughly unchanged at 0.4%.

Sullivan County is more Native American/Other than neighboring Windsor County (0.2% Native American/Other), and Cheshire County (0.3% Native American/Other). Sullivan County is less Native American/Other than neighboring Merrimack County (0.5% Native American/Other), Windham County (0.5% Native American/Other), and Orange County (0.6% Native American/Other).

Sullivan County's Multiracial Population

2,217 residents of Sullivan County, or 5.1% of the population, identify as Multiracial. The share of Multiracial residents in Sullivan County is comparable to the share in New Hampshire overall, where 4% of the population is Multiracial. Sullivan County ranks 1st statewide in terms of Multiracial residents as a share of the population, out of 10 counties.

Since the 2020 Census, Sullivan County's Multiracial population has remained roughly the same. Multiracial residents' share of Sullivan County's population has remained roughly unchanged at 5.1%.

Sullivan County is more Multiracial than neighboring Windsor County (3.9% Multiracial), Cheshire County (4.1% Multiracial), Merrimack County (3.6% Multiracial), Windham County (4.3% Multiracial), and Orange County (3.9% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.