Demographics of Boulder city, Colorado

Boulder city, Colorado had 105,689 people on July 1, 2025, by the Census Bureau’s estimate: −2,742 since July 2020. Age, income, poverty, housing and origin below come from the survey, averaged over 2020–2024, each with its margin of error.

Boulder city, in four figures

105,689
Population: July 1, 2025, Vintage 2025 estimate. The survey’s 2020–⁠2024 figure is 106,433 ±77.; −2.5%
Change since July 2020: −2,742 people.; 28.8 ±0.6
Median age: ACS 2020–⁠2024.; $87,493 ±$6,221
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. The Bureau publishes no births, deaths or migration for a place, so the change is the difference between one July estimate and the next.

Boulder city, Colorado's population shrank 2.5% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Boulder city, Colorado'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).

U.S. Census Bureau — Census Bureau population estimates — incorporated places and New England towns

About this chart

The figures

Boulder city, Colorado's population shrank 2.5% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Boulder city, Colorado'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	108,431	100.0	100.0
2021	104,408	96.3	100.2
2022	106,038	97.8	100.7
2023	106,465	98.2	101.6
2024	106,557	98.3	102.5
2025	105,689	97.5	103.1

Population of Boulder city, Colorado on July 1 of each year, Vintage 2025
July 1	Population	Change
2020	108,431	—
2021	104,408	−4,023
2022	106,038	+1,630
2023	106,465	+427
2024	106,557	+92
2025	105,689	−868

Age, 2020–2024

The median age is 28.8 ±0.6: for men 28.3 ±0.7 and for women 29.4 ±0.6. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Boulder city by age, ACS 2020–2024
Age	People	Share	Colorado	United States
Under 5	2,415 ±305	2.3% ±0.3	5.3% ±<0.1	5.6% ±<0.1
5 to 17	10,091 ±696	9.5% ±0.7	15.7% ±0.1	16.3% ±<0.1
18 to 24	33,303 ±1,718	31.3% ±1.6	9.1% ±0.1	9.1% ±<0.1
25 to 44	27,810 ±1,012	26.1% ±1.0	30.3% ±0.1	26.9% ±<0.1
45 to 64	19,340 ±1,017	18.2% ±1.0	23.9% ±0.1	24.8% ±<0.1
65 and over	13,474 ±749	12.7% ±0.7	15.6% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $87,493 ±$6,221, and income per person $63,074 ±$3,881, in 2024 dollars. The median is $95,470 ±$578 in Colorado and $80,734 ±$166 in the United States.

Households by income

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Households in Boulder city by income, ACS 2020–2024
Household income	Households	Share	Colorado	United States
Under $25,000	8,233 ±751	18.5% ±1.7	11.2% ±0.2	14.6% ±<0.1
$25,000 to $49,999	6,389 ±723	14.4% ±1.6	13.6% ±0.2	16.7% ±<0.1
$50,000 to $74,999	5,284 ±589	11.9% ±1.3	14.6% ±0.2	15.5% ±<0.1
$75,000 to $99,999	3,869 ±492	8.7% ±1.1	12.8% ±0.2	12.6% ±<0.1
$100,000 to $149,999	6,263 ±577	14.1% ±1.3	19.2% ±0.2	17.5% ±<0.1
$150,000 to $199,999	4,024 ±463	9.1% ±1.0	11.7% ±0.2	9.6% ±<0.1
$200,000 or more	10,370 ±525	23.3% ±1.1	17.0% ±0.2	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).

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Poverty rate in Boulder city by age, ACS 2020–2024
Age	Below poverty	Rate	Colorado	United States
All ages	20,337 ±1,323	21.5% ±1.4	9.4% ±0.2	12.5% ±0.1
Under 18	1,121 ±318	9.1% ±2.5	11.1% ±0.3	16.1% ±0.1
18 to 59	18,125 ±1,245	27.7% ±1.7	9.1% ±0.2	11.6% ±0.1
60 and over	1,091 ±244	6.4% ±1.4	8.7% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Boulder city, ACS 2020–2024
Measure	Boulder city	Colorado	United States
Housing units	47,465 ±748	2,589,053 ±653	143,775,355 ±10,234
Occupied	93.6% ±0.9	91.7% ±0.2	89.9% ±0.1
Vacant	6.4% ±1.1	8.3% ±0.2	10.1% ±0.1
Owner occupied	47.2% ±1.5	66.2% ±0.3	65.2% ±0.3
Renter occupied	52.8% ±1.5	33.8% ±0.3	34.8% ±0.1
Median home value	$1,039,500 ±$40,565	$539,400 ±$2,069	$332,700 ±$236
Median gross rent	$2,018 ±$65	$1,761 ±$7	$1,413 ±$2
Median year built	1977 ±2	1988 ±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

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People in Boulder city by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Colorado	United States
Hispanic or Latino	11,368 ±845	10.7% ±0.8	22.5% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	83,051 ±1,008	78.0% ±0.9	64.8% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	1,050 ±251	1.0% ±0.2	3.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	5,740 ±554	5.4% ±0.5	3.2% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	119 to 361	0.1% to 0.3%	0.4% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	5 to 99	< 0.1% to 0.1%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	301 ±142	0.3% ±0.1	0.5% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	4,631 ±619	4.4% ±0.6	4.6% ±0.1	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).

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People in Boulder city by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Colorado	United States
Born in the state	29,962 ±1,323	28.2% ±1.2	41.2% ±0.2	57.3% ±<0.1
Born in another state	62,983 ±1,529	59.2% ±1.4	47.2% ±0.2	26.9% ±<0.1
Born a citizen outside the states	1,946 ±315	1.8% ±0.3	1.7% ±0.1	1.7% ±<0.1
Born abroad	11,542 ±840	10.8% ±0.8	9.8% ±0.1	14.1% ±<0.1
Naturalized citizens	5,497 ±540	5.2% ±0.5	4.7% ±0.1	7.4% ±<0.1
Not citizens	6,045 ±708	5.7% ±0.7	5.2% ±0.1	6.8% ±<0.1

Boulder city among the places of Colorado

11th of 113 places of 5,000 or more by the survey’s 2020–2024 count. Every one is listed on the Colorado page.

Places of Colorado near Boulder city in population, ACS 2020–2024
Place	ACS 2020–⁠2024
Arvada city	122,634 ±84
Westminster city	115,484 ±75
Pueblo city	111,561 ±91
Greeley city	110,806 ±54
Centennial city	108,201 ±78
Boulder city	106,433 ±77
Highlands Ranch CDP	102,257 ±2,318
Longmont city	99,406 ±405
Castle Rock town	79,123 ±51
Loveland city	78,410 ±65
Grand Junction city	68,142 ±46

Elsewhere on the site

Reported crime in Boulder city, Colorado

Sources

Census Bureau population estimates — incorporated places and New England towns — 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

Data retrieved September 25, 2026