Demographics · CO
Longmont, CO demographics: 99,406 residents, with a median age of 40.3 years, from the U.S. Census Bureau's American Community Survey 2020–2024 (5-year estimates).
99,406people live in Longmont, at a median age of 40.3 years (American Community Survey 2020–2024, a 5-year average)
Median age 40.3 years — older than the U.S. median of 38.9.
ACS 2020–2024 5-year · ACS 5-Year Estimates 2020-2024 (released 2026-01-29)
In Longmont, the largest race group is White (72.2%); 24.0% of residents are Hispanic or Latino (of any race); 10.1% were born outside the United States.
ACS 2020–2024 · B01001 / B01002
The median age in Longmont is 40.3 years (±0.7), older than the U.S. median of 38.9 years. The population is 49.7% male and 50.3% female. The largest age band is 25 to 34 at 14.4%.
| Age band | People | Share | ± margin |
|---|---|---|---|
| Under 5 | 4,807 | 4.8% | ±460 |
| 5 to 17 | 13,917 | 14.0% | ±853 |
| 18 to 24 | 9,214 | 9.3% | ±939 |
| 25 to 34 | 14,285 | 14.4% | ±839 |
| 35 to 44 | 13,602 | 13.7% | ±866 |
| 45 to 54 | 11,984 | 12.1% | ±742 |
| 55 to 64 | 13,077 | 13.2% | ±835 |
| 65 to 74 | 11,171 | 11.2% | ±848 |
| 75 and over | 7,349 | 7.4% | ±596 |
Median age by sex: 38.8 (male) · 42.5 (female).
Shares may not sum to 100% due to rounding. 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 Longmont is White at 72.2% of the population. Separately, 24.0% 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 | 71,774 | 72.2% | ±2,080 |
| Black or African American alone | 869 | 0.9% | ±255 |
| American Indian & Alaska Native alone | 580 | 0.6% | ±190 |
| Asian alone | 3,371 | 3.4% | ±703 |
| Native Hawaiian & Pacific Islander alone | 96 | 0.1% | ±68 · low precision |
| Some other race alone | 5,758 | 5.8% | ±1,190 |
| Two or more races | 16,958 | 17.1% | ±1,799 |
| Hispanic or Latino (of any race) | 23,848 | 24.0% | ±1,371 |
Race shares may not sum to 100% due to rounding; race and Hispanic origin are separate questions and are not additive. 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
Longmont has 42,155 households. 58.1% are family households and 30.3% are people living alone. The average household holds 2.33 people.
Total households
42,155
ACS 2020–2024 5-yr · B11001
Avg household size
2.33
ACS 2020–2024 5-yr · B25010 · ±0.05
Family households
58.1%
Share of all households · B11001
Living alone
30.3%
Share of all households · B11001
| Household type | Households | ± margin |
|---|---|---|
| Total households | 42,155 | ±872 |
| Family households | 24,489 | ±772 |
| Nonfamily households | 17,666 | ±973 |
| Householder living alone | 12,756 | ±873 |
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
10.1% of Longmont residents were born outside the United States. 81.7% of residents age 5 and over speak only English at home. The most-spoken non-English language at home is Spanish (13.6%).
| Measure | Value | Source / grain |
|---|---|---|
| Foreign-born share | 10.1% | 10,008 people · B05002 |
| Speak only English at home (age 5+) | 81.7% | C16001 |
| Top non-English language at home | 13.6% | Spanish · 12,820 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
47.0% of adults age 25 and over in Longmont 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+) | 47.0% | 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 Longmont is 0845970. 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/.