Demographics of Hillsborough County, New Hampshire

Hillsborough County, New Hampshire had 433,415 people on July 1, 2025, by the Census Bureau’s estimate: +10,513 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Hillsborough County, in four figures

433,415
Population: July 1, 2025, Vintage 2025 estimate.; +2.5%
Change since July 2020: +10,513 people.; 41.0 ±0.2
Median age: ACS 2020–⁠2024.; $103,545 ±$1,737
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Hillsborough County, New Hampshire's population grew 2.5% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Hillsborough County, New Hampshire's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

Source: The Census Bureau

About this chart

The figures

Hillsborough County, New Hampshire's population grew 2.5% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Hillsborough County, New Hampshire's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	422,902	100.0	100.0
2021	424,484	100.4	100.2
2022	426,329	100.8	100.7
2023	427,475	101.1	101.6
2024	430,442	101.8	102.5
2025	433,415	102.5	103.1

3 more columns on a wider screen

Population of Hillsborough County, New Hampshire on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	422,902	−42	−106	+60	−155
2021	424,484	+1,582	+192	+850	+87
2022	426,329	+1,845	+173	+990	+935
2023	427,475	+1,146	+284	+1,841	−876
2024	430,442	+2,967	+329	+2,730	−40
2025	433,415	+2,973	+430	+1,731	+786

Age, 2020–2024

The median age is 41.0 ±0.2: for men 40.1 ±0.3 and for women 41.9 ±0.3. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

2 more columns on a wider screen

People in Hillsborough County by age, ACS 2020–2024
Age	People	Share	New Hampshire	United States
Under 5	21,392 ±45	5.0% ±<0.1	4.5% ±<0.1	5.6% ±<0.1
5 to 17	62,304 ±1,286	14.6% ±0.3	13.7% ±0.2	16.3% ±<0.1
18 to 24	34,878 ±1,107	8.2% ±0.3	8.7% ±0.2	9.1% ±<0.1
25 to 44	116,186 ±1,493	27.2% ±0.4	25.0% ±0.2	26.9% ±<0.1
45 to 64	117,800 ±1,582	27.6% ±0.4	27.9% ±0.2	24.8% ±<0.1
65 and over	73,818 ±1,651	17.3% ±0.4	20.1% ±0.2	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $103,545 ±$1,737, and income per person $54,111 ±$895, in 2024 dollars. The median is $99,031 ±$1,123 in New Hampshire and $80,734 ±$166 in the United States.

Households by income

2 more columns on a wider screen

Households in Hillsborough County by income, ACS 2020–2024
Household income	Households	Share	New Hampshire	United States
Under $25,000	15,334 ±987	9.1% ±0.6	10.4% ±0.3	14.6% ±<0.1
$25,000 to $49,999	20,961 ±1,271	12.4% ±0.7	13.4% ±0.4	16.7% ±<0.1
$50,000 to $74,999	24,050 ±1,328	14.3% ±0.8	14.3% ±0.4	15.5% ±<0.1
$75,000 to $99,999	21,189 ±1,023	12.6% ±0.6	12.4% ±0.3	12.6% ±<0.1
$100,000 to $149,999	33,280 ±1,384	19.7% ±0.8	20.0% ±0.5	17.5% ±<0.1
$150,000 to $199,999	23,011 ±1,039	13.6% ±0.6	12.7% ±0.3	9.6% ±<0.1
$200,000 or more	30,915 ±1,150	18.3% ±0.7	16.8% ±0.4	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

2 more columns on a wider screen

Poverty rate in Hillsborough County by age, ACS 2020–2024
Age	Below poverty	Rate	New Hampshire	United States
All ages	28,204 ±2,028	6.7% ±0.5	7.2% ±0.3	12.5% ±0.1
Under 18	7,020 ±861	8.5% ±1.0	7.9% ±0.6	16.1% ±0.1
18 to 59	14,150 ±1,242	6.1% ±0.5	6.8% ±0.3	11.6% ±0.1
60 and over	7,034 ±737	6.8% ±0.7	7.7% ±0.4	11.0% ±<0.1

Housing, 2020–2024

1 more column on a wider screen

Housing in Hillsborough County, ACS 2020–2024
Measure	Hillsborough County	New Hampshire	United States
Housing units	177,734 ±330	648,472 ±247	143,775,355 ±10,234
Occupied	94.9% ±0.6	85.7% ±0.3	89.9% ±0.1
Vacant	5.1% ±0.6	14.3% ±0.3	10.1% ±0.1
Owner occupied	67.4% ±0.6	72.8% ±0.4	65.2% ±0.3
Renter occupied	32.6% ±0.7	27.2% ±0.4	34.8% ±0.1
Median home value	$421,100 ±$3,833	$402,500 ±$2,808	$332,700 ±$236
Median gross rent	$1,623 ±$21	$1,491 ±$15	$1,413 ±$2
Median year built	1978 ±1	1979 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

2 more columns on a wider screen

People in Hillsborough County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	New Hampshire	United States
Hispanic or Latino	36,414 ±0	8.5% ±<0.1	4.7% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	341,341 ±1,189	80.1% ±0.3	86.9% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	9,550 ±798	2.2% ±0.2	1.3% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	18,338 ±628	4.3% ±0.1	2.6% ±0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	242 ±84	0.1% ±<0.1	0.1% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 95	0% to < 0.1%	< 0.1%	0.2% ±<0.1
Some other race alone, not Hispanic	2,039 ±436	0.5% ±0.1	0.4% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	18,416 ±1,722	4.3% ±0.4	4.0% ±0.2	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

2 more columns on a wider screen

People in Hillsborough County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	New Hampshire	United States
Born in the state	168,026 ±3,198	39.4% ±0.8	40.8% ±0.4	57.3% ±<0.1
Born in another state	206,934 ±3,184	48.5% ±0.7	51.8% ±0.4	26.9% ±<0.1
Born a citizen outside the states	7,316 ±883	1.7% ±0.2	1.3% ±0.1	1.7% ±<0.1
Born abroad	44,102 ±1,891	10.3% ±0.4	6.1% ±0.2	14.1% ±<0.1
Naturalized citizens	25,102 ±1,468	5.9% ±0.3	3.7% ±0.1	7.4% ±<0.1
Not citizens	19,000 ±1,400	4.5% ±0.3	2.4% ±0.1	6.8% ±<0.1

Hillsborough County among the counties of New Hampshire

1st of 10 by population, July 2025. Every one is listed on the New Hampshire page.

Counties of New Hampshire near Hillsborough County in population, July 2025
County	July 2025	Change since 2020
Hillsborough County	433,415	+2.5%
Rockingham County	324,077	+3.0%
Merrimack County	158,078	+2.6%
Strafford County	135,043	+3.0%
Grafton County	93,225	+2.2%
Cheshire County	78,269	+2.3%

Elsewhere on the site

Rankings this appears in

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Compiled automatically from Census Bureau population estimates — counties and Puerto Rico municipios, with components of change and American Community Survey 5-year estimates — table-based Summary File by a checked SQL query · Editor: Kian O'Connor · How this site is built

Data retrieved September 25, 2026