Boulder County Demographics

A map of Boulder County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	245,197	245,203	74.5%	74.1%
Hispanic	48,466	48,168	14.7%	14.6%
Multiracial	15,702	14,774	4.8%	4.5%
Asian	15,302	16,291	4.7%	4.9%
Black	2,490	3,149	0.8%	1.0%
Native American/Other	1,804	3,173	0.5%	1.0%

Boulder County, Colorado has an estimated population of 328,961, a less than 1% change from the 330,758 recorded in the 2020 Census. The population is 74.5% White, 14.7% Hispanic, 4.8% Multiracial, 4.7% Asian, 0.8% Black, and 0.5% Native American/Other. This demographic dot map shows the population of Boulder County, with one dot drawn for each person counted by the Census, color-coded by race.

Boulder has become slightly less racially diverse since the 2020 Census. It is considerably less diverse than Colorado overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Boulder County, that probability was 42.5% in 2020 and 41.8% in the most recent ACS estimates.

Boulder County is ranked the 9th most populous county in Colorado, out of 64 counties. Boulder County was ranked the 8th most populous county in the 2020 Census.

Boulder County's White Population

245,197 residents of Boulder County, or 74.5% of the population, identify as White. The share of White residents in Boulder County is higher than in Colorado overall, where 64.8% of the population is White. Boulder County ranks 38th statewide in terms of White residents as a share of the population, out of 64 counties.

Since the 2020 Census, Boulder County's White population has remained roughly the same. White residents' share of Boulder County's population has remained roughly unchanged at 74.5%.

Boulder County is more White than neighboring Broomfield County (72.4% White). Boulder County is less White than neighboring Gilpin County (84.8% White), Clear Creek County (85.8% White), Jefferson County (75.2% White), and Larimer County (79.2% White).

Boulder County's Black Population

2,490 residents of Boulder County, or 0.8% of the population, identify as Black. The share of Black residents in Boulder County is slightly lower than in Colorado overall, where 3.8% of the population is Black. Boulder County ranks 21st statewide in terms of Black residents as a share of the population, out of 64 counties.

Since the 2020 Census, Boulder County's Black population has declined by an estimated 20.9%. Black residents' share of Boulder County's population has remained roughly unchanged at 0.8%.

Boulder County is more Black than neighboring Clear Creek County (0.1% Black). Boulder County is less Black than neighboring Gilpin County (2.6% Black), Broomfield County (1.1% Black), Jefferson County (1.1% Black), and Larimer County (1% Black).

Boulder County's Asian Population

15,302 residents of Boulder County, or 4.7% of the population, identify as Asian. The share of Asian residents in Boulder County is comparable to the share in Colorado overall, where 3.2% of the population is Asian. Boulder County ranks 4th statewide in terms of Asian residents as a share of the population, out of 64 counties.

Since the 2020 Census, Boulder County's Asian population has declined by an estimated 6.1%. Asian residents' share of Boulder County's population has remained roughly unchanged at 4.7%.

Boulder County is more Asian than neighboring Gilpin County (1.1% Asian), Clear Creek County (1.8% Asian), Jefferson County (2.9% Asian), and Larimer County (2.2% Asian). Boulder County is less Asian than neighboring Broomfield County (6.9% Asian).

Boulder County's Hispanic Population

48,466 residents of Boulder County, or 14.7% of the population, identify as Hispanic. The share of Hispanic residents in Boulder County is lower than in Colorado overall, where 22.5% of the population is Hispanic. Boulder County ranks 33rd statewide in terms of Hispanic residents as a share of the population, out of 64 counties.

Since the 2020 Census, Boulder County's Hispanic population has remained roughly the same. Hispanic residents' share of Boulder County's population has remained roughly unchanged at 14.7%.

Boulder County is more Hispanic than neighboring Gilpin County (7.4% Hispanic), Broomfield County (14.1% Hispanic), Clear Creek County (7.8% Hispanic), and Larimer County (12.9% Hispanic). Boulder County is less Hispanic than neighboring Jefferson County (16.1% Hispanic).

Boulder County's Native American/Other Population

1,804 residents of Boulder County, or 0.5% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Boulder County is comparable to the share in Colorado overall, where 1% of the population is Native American/Other. Boulder County ranks 44th statewide in terms of Native American/Other residents as a share of the population, out of 64 counties.

Since the 2020 Census, Boulder County's Native American/Other population has declined by an estimated 43.1%. Native American/Other residents' share of Boulder County's population has decreased from 1.0% to 0.5%.

Boulder County is less Native American/Other than neighboring Gilpin County (1.2% Native American/Other), Broomfield County (0.8% Native American/Other), Clear Creek County (1.5% Native American/Other), Jefferson County (0.7% Native American/Other), and Larimer County (0.9% Native American/Other).

Boulder County's Multiracial Population

15,702 residents of Boulder County, or 4.8% of the population, identify as Multiracial. The share of Multiracial residents in Boulder County is comparable to the share in Colorado overall, where 4.6% of the population is Multiracial. Boulder County ranks 16th statewide in terms of Multiracial residents as a share of the population, out of 64 counties.

Since the 2020 Census, Boulder County's Multiracial population has grown by an estimated 6.3%. Multiracial residents' share of Boulder County's population has remained roughly unchanged at 4.8%.

Boulder County is more Multiracial than neighboring Gilpin County (3% Multiracial), Broomfield County (4.7% Multiracial), Clear Creek County (3% Multiracial), Jefferson County (4% Multiracial), and Larimer County (3.8% 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.