Get ready-to-use data, reports, analysis, and visualizations covering the demographics of Humboldt County, California based on the current United States Census Bureau's 2023 American Community Survey (ACS) 5-Year Estimates.
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Humboldt County, California Demographics: Sex by Age

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the total population of Humboldt County, California is 135,418. The median age of the population in Humboldt County, California is 39.6. The median age for males is 39.3 years, and for females, it is 40.0 years.
The age distribution of the population in Humboldt County, California is as follows:
- Under 5 years: 4.77%
- 5–17 years (children): 14.20%
- 18–24 years (young adults): 11.99%
- 25–34 years: 13.20%
- 35–54 years: 24.34%
- 55–64 years: 12.24%
- 65 years and over (seniors): 19.26%
The total dependency ratio in Humboldt County, California is 61.88%. The youth dependency ratio is 30.70%, and the old-age dependency ratio is 31.18%. In demographic terms, the dependency ratio measures the size of the population typically not in the labor force (children and older adults) relative to those of working age.
Humboldt County, California Demographics: Population by Race & Ethnicity

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the breakdown of the population in Humboldt County, California by race and ethnicity (racial demographics) is as follows:
- White: 70.24%
- Black/African American: 1.12%
- American Indian and Alaska Native: 3.04%
- Asian: 3.03%
- Native Hawaiian or Other Pacific Islander: 0.23%
- Some other race: 0.66%
- Two or more races: 7.83%
- Hispanic or Latino: 13.84%
The diversity index score in Humboldt County, California is 47.93%, suggesting a moderate level of diversity.
Humboldt County, California Demographics: Household Income

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the median household income in Humboldt County, California over the past 12 months, adjusted for 2023 inflation, was $61,135.
The distribution of household income by income bracket in Humboldt County, California is as follows:
- Less than $20,000: 16.18%
- $20,000–$34,999: 13.39%
- $35,000–$49,999: 12.53%
- $50,000–$74,999: 16.59%
- $75,000–$149,999: 26.51%
- $150,000 or more: 14.80%
Humboldt County, California Demographics: Educational Attainment

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the breakdown of the total population of Humboldt County, California, age 25 and older, by educational level is as follows:
- Less than high school graduate: 8.48%
- High school graduate (incl. equivalency): 23.24%
- Some college or associate's degree: 36.20%
- Bachelor's Degree: 20.88%
- Graduate or professional degree: 11.21%
In Humboldt County, California, 32.09% of the population has a bachelor's degree or higher, while 91.52% are high school graduates or higher.
Humboldt County, California Demographics: Health Insurance Coverage Status by Sex by Age

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the uninsured rate in Humboldt County, California is 5.78%.
Rates of people in Humboldt County, California lacking health insurance coverage, by age group and sex are as follows:
- Under 18: 2.88% of males and 1.57% of females are uninsured
- Ages 18–34: 5.70% of males and 4.27% of females are uninsured
- Ages 35–64: 12.63% of males and 6.88% of females are uninsured
- Ages 65 and older: 0.11% of males and 1.65% of females are uninsured
Humboldt County, California Demographics: Nativity and Citizenship Status in the United States

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, 97.00% of people living in Humboldt County, California are U.S. citizens. This includes individuals born in the United States, Puerto Rico, or U.S. Island Areas, those born abroad to American parents, and those who became citizens through naturalization. 3.44% of the population obtained U.S. citizenship through the naturalization process. In Humboldt County, California, 3.44% of the population are naturalized immigrants, who obtained U.S. citizenship through the immigration and naturalization process.
Humboldt County, California Demographics: Means of Transportation to Work

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the means of transportation to work for the population of Humboldt County, California are distributed as follows:
- Car, truck, or van: 79.53%
- Public transportation (excluding taxicab): 0.81%
- Bicycle: 0.95%
- Walked: 5.35%
- Taxicab, motorcycle, or other means: 1.48%
- Worked from home: 11.87%
Frequently Asked Questions
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the age breakdown of the population of Humboldt County, California is as follows:
- Under 5: 4.77%
- Ages 5–17: 14.20%
- Ages 18–24: 11.99%
- Ages 25–34: 13.20%
- Ages 35–54: 24.34%
- Ages 55–64: 12.24%
- 65 or older: 19.26%
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the racial demographics of the population of Humboldt County, California are as follows:
- White: 70.24%
- Black/African American: 1.12%
- American Indian and Alaska Native: 3.04%
- Asian: 3.03%
- Native Hawaiian or Other Pacific Islander: 0.23%
- Some other race: 0.66%
- Two or more races: 7.83%
- Hispanic or Latino: 13.84%
* Hispanic includes respondents of any race. Other categories are non-Hispanic.
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the distribution of household income in Humboldt County, California by income bracket is as follows:
- Less than $20,000: 16.18%
- $20,000–$34,999: 13.39%
- $35,000–$49,999: 12.53%
- $50,000–$74,999: 16.59%
- $75,000–$149,999: 26.51%
- $150,000 or more: 14.80%
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the median household income in Humboldt County, California in the past 12 months, in 2023 inflation-adjusted dollars, was $61,135.
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, 70.24% of the population in Humboldt County, California identifies as White alone (not Hispanic or Latino).
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, 1.12% of the population in Humboldt County, California identifies as Black or African American alone (not Hispanic or Latino).
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, 5.78% of the population of Humboldt County, California lacks health insurance coverage.
The detailed breakdown by age and sex is as follows:
- Under 18: 2.88% of males and 1.57% of females
- Ages 18–34: 5.70% of males and 4.27% of females
- Ages 35–64: 12.63% of males and 6.88% of females
- Ages 65 and over: 0.11% of males and 1.65% of females