Demographics · CO
Thornton, CO demographics: 144,187 residents, with a median age of 34.7 years, from the U.S. Census Bureau's American Community Survey 2020–2024 (5-year estimates).
144,187 people live in Thornton, at a median age of 34.7 years (American Community Survey 2020–2024, a 5-year average)
Median age 34.7 years — younger than the U.S. median of 38.9.
ACS 2020–2024 5-year · ACS 5-Year Estimates 2020-2024 (released 2026-01-29)
In Thornton, the largest race group is White (58.8%); 37.7% of residents are Hispanic or Latino (of any race); 14.0% were born outside the United States.
ACS 2020–2024 · B01001 / B01002
The median age in Thornton is 34.7 years (±0.7), younger than the U.S. median of 38.9 years. The population is 50.0% male and 50.0% female. The largest age band is 5 to 17 at 18.7%.
| Age band | People | Share | ± margin |
|---|---|---|---|
| Under 5 | 9,049 | 6.3% | ±938 |
| 5 to 17 | 26,927 | 18.7% | ±1,364 |
| 18 to 24 | 14,408 | 10.0% | ±1,034 |
| 25 to 34 | 22,403 | 15.5% | ±1,123 |
| 35 to 44 | 22,779 | 15.8% | ±1,133 |
| 45 to 54 | 18,401 | 12.8% | ±950 |
| 55 to 64 | 14,630 | 10.1% | ±953 |
| 65 to 74 | 10,330 | 7.2% | ±654 |
| 75 and over | 5,260 | 3.6% | ±537 |
Median age by sex: 33.9 (male) · 35.3 (female).
Source: U.S. Census Bureau, ACS 5-Year 2020–2024 (B01001 sex by age, B01002 median age) · place-grain · margins of error at the 90% confidence level · methodology →
ACS 2020–2024 · B02001 / B03003
The largest race group in Thornton is White at 58.8% of the population. Separately, 37.7% of residents are Hispanic or Latino of any race. Race and Hispanic origin are two different questions on the census form, so their shares are reported separately and are not additive.
| Race (alone, or two or more) | People | Share | ± margin |
|---|---|---|---|
| White alone | 84,741 | 58.8% | ±2,287 |
| Black or African American alone | 3,495 | 2.4% | ±881 |
| American Indian & Alaska Native alone | 2,257 | 1.6% | ±747 |
| Asian alone | 7,702 | 5.3% | ±1,005 |
| Native Hawaiian & Pacific Islander alone | 218 | 0.2% | ±165 · low precision |
| Some other race alone | 16,134 | 11.2% | ±1,976 |
| Two or more races | 29,640 | 20.6% | ±2,307 |
| Hispanic or Latino (of any race) | 54,293 | 37.7% | ±2,109 |
Source: U.S. Census Bureau, ACS 5-Year 2020–2024 (B02001 race, B03003 Hispanic or Latino origin) · place-grain · margins of error at the 90% confidence level · methodology →
ACS 2020–2024 · B11001 / B25010
Thornton has 50,566 households. 70.3% are family households and 21.0% are people living alone. The average household holds 2.84 people.
Total households
50,566
ACS 2020–2024 5-yr · B11001
Avg household size
2.84
ACS 2020–2024 5-yr · B25010 · ±0.05
Family households
70.3%
Share of all households · B11001
Living alone
21.0%
Share of all households · B11001
| Household type | Households | ± margin |
|---|---|---|
| Total households | 50,566 | ±983 |
| Family households | 35,533 | ±846 |
| Nonfamily households | 15,033 | ±1,161 |
| Householder living alone | 10,628 | ±956 |
Source: U.S. Census Bureau, ACS 5-Year 2020–2024 (B11001 household type, B25010 average household size) · place-grain · methodology →
ACS 2020–2024 · B05002 / C16001
14.0% of Thornton residents were born outside the United States. 74.1% of residents age 5 and over speak only English at home. The most-spoken non-English language at home is Spanish (19.7%).
| Measure | Value | Source / grain |
|---|---|---|
| Foreign-born share | 14.0% | 20,251 people · B05002 |
| Speak only English at home (age 5+) | 74.1% | C16001 |
| Top non-English language at home | 19.7% | Spanish · 26,621 speakers · C16001 |
Source: U.S. Census Bureau, ACS 5-Year 2020–2024 (B05002 place of birth, C16001 language spoken at home) · place-grain · methodology →
ACS 2020–2024 · B15003
32.8% of adults age 25 and over in Thornton hold a bachelor's degree or higher (the U.S. share is about 35%).
| Measure | Value | Source / grain |
|---|---|---|
| Bachelor's degree or higher (age 25+) | 32.8% | B15003 lines 22–25 over line 1 · place-grain |
Source: U.S. Census Bureau, ACS 5-Year 2020–2024 (B15003 educational attainment, population 25+) · place-grain · methodology →
Sources · provenance
The GEOID for Thornton is 0877290. Every figure on this page is a place-grain American Community Survey 5-Year 2020–2024 estimate (ACS 5-Year Estimates 2020-2024 (released 2026-01-29)) shown with its margin of error. Full per-dataset detail: /sources/.