Hillsborough County Demographics

A map of Hillsborough County's Population by Race

Hillsborough County, New Hampshire had a population of 422,937 in 2020. It was 81.0% White, 2.4% Black, 3.9% Asian, 7.9% Hispanic, 0.7% Native American/Other, and 4.1% Multiracial. This map presents the population of Hillsborough County, with one dot drawn for each person counted in the 2020 Census, color-coded by race.

Hillsborough County is the most populous county of the 10 counties in New Hampshire.

Hillsborough County's White Population

342,652 residents of Hillsborough County identify as White, or 81.0%. This makes the White share of the population of Hillsborough County slightly less than the White share of the population of New Hampshire (87.2% White). Of the 10 counties in New Hampshire, Hillsborough County is ranked #10 in terms of White residents as a share of the population.

Hillsborough County is more White than neighboring Middlesex County (66.5% White), and Worcester County (70.9% White). Hillsborough County is less White than neighboring Merrimack County (89.2% White), Cheshire County (90.6% White), and Rockingham County (90.1% White).

Hillsborough County's Black Population

10,044 residents of Hillsborough County identify as Black, or 2.4%. This makes the Black share of the population of Hillsborough County roughly similar to the Black share of the population of New Hampshire (1.4% Black). Of the 10 counties in New Hampshire, Hillsborough County is ranked #1 in terms of Black residents as a share of the population.

Hillsborough County is more Black than neighboring Merrimack County (1.6% Black), Cheshire County (0.8% Black), and Rockingham County (0.7% Black). Hillsborough County is less Black than neighboring Middlesex County (5% Black), and Worcester County (5.1% Black).

Hillsborough County's Asian Population

16,413 residents of Hillsborough County identify as Asian, or 3.9%. This makes the Asian share of the population of Hillsborough County roughly similar to the Asian share of the population of New Hampshire (2.6% Asian). Of the 10 counties in New Hampshire, Hillsborough County is ranked #1 in terms of Asian residents as a share of the population.

Hillsborough County is more Asian than neighboring Merrimack County (2% Asian), Cheshire County (1.4% Asian), and Rockingham County (2% Asian). Hillsborough County is less Asian than neighboring Middlesex County (12.8% Asian), and Worcester County (5.3% Asian).

Hillsborough County's Hispanic Population

33,498 residents of Hillsborough County identify as Hispanic, or 7.9%. This makes the Hispanic share of the population of Hillsborough County roughly similar to the Hispanic share of the population of New Hampshire (4.3% Hispanic). Of the 10 counties in New Hampshire, Hillsborough County is ranked #1 in terms of Hispanic residents as a share of the population.

Hillsborough County is more Hispanic than neighboring Merrimack County (2.5% Hispanic), Cheshire County (2.4% Hispanic), and Rockingham County (3.3% Hispanic). Hillsborough County is less Hispanic than neighboring Middlesex County (8.8% Hispanic), and Worcester County (13% Hispanic).

Hillsborough County's Native American/Other Population

3,125 residents of Hillsborough County identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other, or 0.7%. This makes the Native American/Other share of the population of Hillsborough County roughly similar to the Native American/Other share of the population of New Hampshire (0.6% Native American/Other). Of the 10 counties in New Hampshire, Hillsborough County is ranked #2 in terms of Native American/Other residents as a share of the population.

Hillsborough County is more Native American/Other than neighboring Merrimack County (0.6% Native American/Other), and Rockingham County (0.5% Native American/Other). Hillsborough County is less Native American/Other than neighboring Middlesex County (1.8% Native American/Other), and Worcester County (1.2% Native American/Other).

Hillsborough County's Multiracial Population

17,205 residents of Hillsborough County identify as Multiracial, or 4.1%. This makes the Multiracial share of the population of Hillsborough County roughly similar to the Multiracial share of the population of New Hampshire (4% Multiracial). Of the 10 counties in New Hampshire, Hillsborough County is ranked #5 in terms of Multiracial residents as a share of the population.

Hillsborough County is more Multiracial than neighboring Merrimack County (4% Multiracial), and Rockingham County (3.5% Multiracial). Hillsborough County is less Multiracial than neighboring Cheshire County (4.2% Multiracial), Middlesex County (5% Multiracial), and Worcester County (4.4% Multiracial).

Source: 2020 Census State Redistricting Data and Census TIGER/Line Shapefiles.