Boulder County, Colorado
Located in Colorado, Boulder County has a population of 328,961 residents and a median age of 37.7 years, making it the #223 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 11.2%. The median home value is $756,300, and the median household income is $103,994, which is 38% above the national median.
Demographics
Boulder County has a population of 328,961, making it the #223 most populous county in the US. The median age is 37.7 years, which is 3.1% below the national median.
Population Trend
Rankings →Year-over-Year Population Growth
Age & Sex Distribution
Race & Ethnicity
Nativity
Geographic Mobility (Past Year)
Economy
The median household income in Boulder County is $103,994, ranking #132 out of 3,222 counties — 38.4% above the national median. The poverty rate is 11.2% and unemployment stands at 4.8%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Boulder County is $756,300 (+168.3% vs national). Renters pay a median of $1,966/mo and the homeownership rate is 62.0%.
Median Home Value Trend
Rankings →Household Type
Education
In Boulder County, 64.2% of adults age 25+ hold a bachelor's degree or higher, which is 90.4% above the national average, ranking #12 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Boulder County is 82.3 years. 11.4% of adults report poor or fair health and 5.9% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
10.3% of adults in Boulder County smoke , 18.6% are obese , and 23.2% report excessive drinking. The drug overdose death rate is 16.7 per 100,000.
Adult Smoking Trend
Safety
The homicide rate in Boulder County is 2.2 per 100,000 and the suicide rate is 18.1 per 100,000. Motor vehicle deaths occur at a rate of 8.8 per 100,000.
Homicide Rate Trend
Families & Children
7.8% of children in Boulder County live in poverty and the infant mortality rate is 3.3 per 1,000 live births. The teen birth rate is 5.0 per 1,000 females age 15–19.
Infant Mortality Trend
Civic & Transportation
Voter turnout in Boulder County is 83.6%. The mean commute time is 24.8 min, which is 10.0% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Boulder County voted Democratic with a margin of 55.7%. The vote was 76.5% Dem / 20.8% Rep. Compared to 2020, the margin shifted 0.9 toward Republicans .
Vote Share Over Time
About Boulder County, Colorado
Boulder County, Colorado has a total population of 328,961, making it the 223rd most populous county in the United States. The median age in Boulder County is 37.7 years, which is 3.1% below the national median of 38.9 years.
The median household income in Boulder County is $103,994, which ranks #132 of 3,222 counties nationwide. This is 38.4% above the national median of $75,149. The poverty rate is 11.2%, lower than the national rate of 12.6%. The unemployment rate stands at 4.8%.
The median home value in Boulder County is $756,300, 168.3% above the national median. Renters in Boulder County pay a median gross rent of $1,966 per month. The homeownership rate is 62.0%, compared to the national rate of 64.4%.
In Boulder County, 64.2% of residents aged 25 and older hold a bachelor's degree or higher, 90.4% above the national average of 33.7%. Health insurance coverage stands at 95.6% of the population. The average commute time for workers is 24.8 min.
Boulder County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 74.5% of the population, followed by Hispanic or Latino (14.7%) and Two or More Races (4.8%).
All data for Boulder County, Colorado comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates. These figures are estimates based on survey sampling and are subject to margin of error. For the most detailed and up-to-date data, visit the Census Bureau's official data portal.