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

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the total population of Penobscot County, Maine is 153,571. The median age of the population in Penobscot County, Maine is 42.5. The median age for males is 41.0 years, and for females, it is 44.1 years.
The age distribution of the population in Penobscot County, Maine is as follows:
- Under 5 years: 4.37%
- 5–17 years (children): 13.46%
- 18–24 years (young adults): 9.99%
- 25–34 years: 12.75%
- 35–54 years: 24.64%
- 55–64 years: 15.03%
- 65 years and over (seniors): 19.76%
The total dependency ratio in Penobscot County, Maine is 60.24%. The youth dependency ratio is 28.58%, and the old-age dependency ratio is 31.66%. 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.
Penobscot County, Maine 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 Penobscot County, Maine by race and ethnicity (racial demographics) is as follows:
- White: 91.43%
- Black/African American: 0.97%
- American Indian and Alaska Native: 0.81%
- Asian: 1.08%
- Native Hawaiian or Other Pacific Islander: 0.05%
- Some other race: 0.57%
- Two or more races: 3.16%
- Hispanic or Latino: 1.93%
The diversity index score in Penobscot County, Maine is 16.23%, suggesting a very Low level of diversity.
Penobscot County, Maine Demographics: Household Income

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the median household income in Penobscot County, Maine over the past 12 months, adjusted for 2023 inflation, was $63,248.
The distribution of household income by income bracket in Penobscot County, Maine is as follows:
- Less than $20,000: 13.21%
- $20,000–$34,999: 14.11%
- $35,000–$49,999: 13.14%
- $50,000–$74,999: 17.53%
- $75,000–$149,999: 28.55%
- $150,000 or more: 13.46%
Penobscot County, Maine 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 Penobscot County, Maine, age 25 and older, by educational level is as follows:
- Less than high school graduate: 5.47%
- High school graduate (incl. equivalency): 32.43%
- Some college or associate's degree: 31.63%
- Bachelor's Degree: 18.90%
- Graduate or professional degree: 11.57%
In Penobscot County, Maine, 30.48% of the population has a bachelor's degree or higher, while 94.53% are high school graduates or higher.
Penobscot County, Maine 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 Penobscot County, Maine is 7.18%.
Rates of people in Penobscot County, Maine lacking health insurance coverage, by age group and sex are as follows:
- Under 18: 3.90% of males and 4.98% of females are uninsured
- Ages 18–34: 6.35% of males and 4.73% of females are uninsured
- Ages 35–64: 13.73% of males and 8.73% of females are uninsured
- Ages 65 and older: 0.06% of males and 4.18% of females are uninsured
Penobscot County, Maine 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, 98.46% of people living in Penobscot County, Maine 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. 1.65% of the population obtained U.S. citizenship through the naturalization process. In Penobscot County, Maine, 1.65% of the population are naturalized immigrants, who obtained U.S. citizenship through the immigration and naturalization process.
Penobscot County, Maine 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 Penobscot County, Maine are distributed as follows:
- Car, truck, or van: 83.73%
- Public transportation (excluding taxicab): 0.46%
- Bicycle: 0.39%
- Walked: 3.59%
- Taxicab, motorcycle, or other means: 1.25%
- Worked from home: 10.58%
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 Penobscot County, Maine is as follows:
- Under 5: 4.37%
- Ages 5–17: 13.46%
- Ages 18–24: 9.99%
- Ages 25–34: 12.75%
- Ages 35–54: 24.64%
- Ages 55–64: 15.03%
- 65 or older: 19.76%
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the racial demographics of the population of Penobscot County, Maine are as follows:
- White: 91.43%
- Black/African American: 0.97%
- American Indian and Alaska Native: 0.81%
- Asian: 1.08%
- Native Hawaiian or Other Pacific Islander: 0.05%
- Some other race: 0.57%
- Two or more races: 3.16%
- Hispanic or Latino: 1.93%
* 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 Penobscot County, Maine by income bracket is as follows:
- Less than $20,000: 13.21%
- $20,000–$34,999: 14.11%
- $35,000–$49,999: 13.14%
- $50,000–$74,999: 17.53%
- $75,000–$149,999: 28.55%
- $150,000 or more: 13.46%
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the median household income in Penobscot County, Maine in the past 12 months, in 2023 inflation-adjusted dollars, was $63,248.
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, 91.43% of the population in Penobscot County, Maine identifies as White alone (not Hispanic or Latino).
According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, 0.97% of the population in Penobscot County, Maine 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, 7.18% of the population of Penobscot County, Maine lacks health insurance coverage.
The detailed breakdown by age and sex is as follows:
- Under 18: 3.90% of males and 4.98% of females
- Ages 18–34: 6.35% of males and 4.73% of females
- Ages 35–64: 13.73% of males and 8.73% of females
- Ages 65 and over: 0.06% of males and 4.18% of females