Demographics of Thornton city, Colorado

Thornton city, Colorado had 147,766 people on July 1, 2025, by the Census Bureau’s estimate: +5,604 since July 2020. Age, income, poverty, housing and origin below come from the survey, averaged over 2020–2024, each with its margin of error.

Thornton city, in four figures

147,766
Population: July 1, 2025, Vintage 2025 estimate. The survey’s 2020–⁠2024 figure is 144,187 ±118.; +3.9%
Change since July 2020: +5,604 people.; 34.7 ±0.7
Median age: ACS 2020–⁠2024.; $103,088 ±$2,467
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.

Thornton city, Colorado's population grew 3.9% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Thornton 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).

Source: The Census Bureau

About this chart

The figures

Thornton city, Colorado's population grew 3.9% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Thornton 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	142,162	100.0	100.0
2021	142,827	100.5	100.2
2022	143,358	100.8	100.7
2023	145,933	102.7	101.6
2024	148,370	104.4	102.5
2025	147,766	103.9	103.1

Population of Thornton city, Colorado on July 1 of each year, Vintage 2025
July 1	Population	Change
2020	142,162	—
2021	142,827	+665
2022	143,358	+531
2023	145,933	+2,575
2024	148,370	+2,437
2025	147,766	−604

Age, 2020–2024

The median age is 34.7 ±0.7: for men 33.9 ±1.0 and for women 35.3 ±0.9. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Thornton city by age, ACS 2020–2024
Age	People	Share	Colorado	United States
Under 5	9,049 ±938	6.3% ±0.7	5.3% ±<0.1	5.6% ±<0.1
5 to 17	26,927 ±1,364	18.7% ±0.9	15.7% ±0.1	16.3% ±<0.1
18 to 24	14,408 ±1,034	10.0% ±0.7	9.1% ±0.1	9.1% ±<0.1
25 to 44	45,182 ±1,596	31.3% ±1.1	30.3% ±0.1	26.9% ±<0.1
45 to 64	33,031 ±1,345	22.9% ±0.9	23.9% ±0.1	24.8% ±<0.1
65 and over	15,590 ±847	10.8% ±0.6	15.6% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $103,088 ±$2,467, and income per person $43,571 ±$1,498, 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 Thornton city by income, ACS 2020–2024
Household income	Households	Share	Colorado	United States
Under $25,000	3,676 ±598	7.3% ±1.2	11.2% ±0.2	14.6% ±<0.1
$25,000 to $49,999	6,215 ±729	12.3% ±1.4	13.6% ±0.2	16.7% ±<0.1
$50,000 to $74,999	7,211 ±709	14.3% ±1.4	14.6% ±0.2	15.5% ±<0.1
$75,000 to $99,999	7,293 ±802	14.4% ±1.6	12.8% ±0.2	12.6% ±<0.1
$100,000 to $149,999	11,876 ±845	23.5% ±1.6	19.2% ±0.2	17.5% ±<0.1
$150,000 to $199,999	6,587 ±726	13.0% ±1.4	11.7% ±0.2	9.6% ±<0.1
$200,000 or more	7,708 ±695	15.2% ±1.3	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 Thornton city by age, ACS 2020–2024
Age	Below poverty	Rate	Colorado	United States
All ages	10,036 ±1,673	7.0% ±1.2	9.4% ±0.2	12.5% ±0.1
Under 18	3,060 ±653	8.7% ±1.8	11.1% ±0.3	16.1% ±0.1
18 to 59	5,380 ±1,006	6.3% ±1.2	9.1% ±0.2	11.6% ±0.1
60 and over	1,596 ±370	7.2% ±1.6	8.7% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Thornton city, ACS 2020–2024
Measure	Thornton city	Colorado	United States
Housing units	52,250 ±961	2,589,053 ±653	143,775,355 ±10,234
Occupied	96.8% ±0.6	91.7% ±0.2	89.9% ±0.1
Vacant	3.2% ±0.8	8.3% ±0.2	10.1% ±0.1
Owner occupied	71.4% ±1.7	66.2% ±0.3	65.2% ±0.3
Renter occupied	28.6% ±1.6	33.8% ±0.3	34.8% ±0.1
Median home value	$517,500 ±$11,205	$539,400 ±$2,069	$332,700 ±$236
Median gross rent	$1,895 ±$43	$1,761 ±$7	$1,413 ±$2
Median year built	1997 ±1	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 Thornton city by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Colorado	United States
Hispanic or Latino	54,293 ±2,109	37.7% ±1.5	22.5% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	72,383 ±1,913	50.2% ±1.3	64.8% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	2,923 ±742	2.0% ±0.5	3.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	7,504 ±981	5.2% ±0.7	3.2% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	373 ±153	0.3% ±0.1	0.4% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	41 to 363	< 0.1% to 0.3%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	610 ±242	0.4% ±0.2	0.5% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	5,899 ±867	4.1% ±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 Thornton city by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Colorado	United States
Born in the state	72,402 ±2,121	50.2% ±1.5	41.2% ±0.2	57.3% ±<0.1
Born in another state	49,239 ±1,961	34.1% ±1.4	47.2% ±0.2	26.9% ±<0.1
Born a citizen outside the states	2,295 ±593	1.6% ±0.4	1.7% ±0.1	1.7% ±<0.1
Born abroad	20,251 ±1,542	14.0% ±1.1	9.8% ±0.1	14.1% ±<0.1
Naturalized citizens	7,206 ±741	5.0% ±0.5	4.7% ±0.1	7.4% ±<0.1
Not citizens	13,045 ±1,451	9.0% ±1.0	5.2% ±0.1	6.8% ±<0.1

Thornton city among the places of Colorado

5th 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 Thornton city in population, ACS 2020–2024
Place	ACS 2020–⁠2024
Colorado Springs city	487,887 ±110
Aurora city	394,432 ±85
Fort Collins city	170,229 ±96
Lakewood city	156,583 ±83
Thornton city	144,187 ±118
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

Elsewhere on the site

Reported crime in Thornton city, Colorado

Rankings this appears in

No. 8 Places in Colorado by foreign-born share
No. 18 Places in Colorado by Hispanic or Latino share
No. 26 Places in Colorado by median rent
No. 30 Places in Colorado by poverty rate
No. 36 Places in Colorado by median household income
No. 42 Places in Colorado by homeownership rate

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

Compiled automatically from Census Bureau population estimates — incorporated places and New England towns 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