Overview
          331
                  Total Population
                34.9
                  Median age
                52.87%
                  Female population %
                89.1:100
                  Gender ratio (M:F)
                60-64 years
                  Largest age group
                51.8
                  Total dependency ratio
                White
                  Largest racial group
                2
                  Hispanic population
                Sources: U.S. Census Bureau, American Community Survey (ACS) 2021
TABLE OF CONTENTS
Age
Mill Creek's population is young compared to the rest of the country:
- The median age in Mill Creek is 34.9, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
 - Mill Creek's population under 18 was 24.17%, compared to the 22.51% nationwide.
 - Mill Creek's elderly or the senior population (over 65 age) was 13.29% as compared to 16.04% nationwide.
 - Of the total population in Mill Creek, 20.85% were under the age of 15, 21.15% aged 15 to 29, 44.71% aged 30 to 64, 11.48% aged 65 to 84, and 1.81% were 85 years of age and older.
 
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Gender
There are 19 more females than males in Mill Creek:
- The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 52.87% females and 47.13% males in Mill Creek, PA.
 - The Mill Creek, PA gender ratio is 89.1:100 i.e. 89.1 men to 100 women (0.891).
 - For male population, the largest age group is 60-64 years with a population of 20.
 - For the female population, the largest age group is 25-29 years with a population of 27.
 
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Race / Ethnicity
Mill Creek's population is moderately diverse:
- Racial distribution of Mill Creek population: 98.79% are White, 0.91% are some other race and 0.30% are multiracial.
 - Mill Creek's racial breakdown clearly shows that there is an absolute majority of White population in the borough.
 - By ethnicity, 2 is Hispanic or Latino (of any race), and 329 (99.40% of the total population) is Non-Hispanic.
 - The largest racial group in Mill Creek is White with a population of 327 (98.79% of the total population).
 
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Year by year
Mill Creek's population has already reached its peak and is showing a trend of decline:
- The peak population was 350 in the year 2000
 - From 2000 to 2010, Mill Creek's population decreased by 22 (6.29%), as compared to the national growth of 9.63%.
 - From 2010 to 2020, Mill Creek's population decreased by 42 (12.80%), according to Census Bureau's Population Estimates Program. For the same period, the rate of growth for the United States was 7.17%.
 - Between the year 2000 and 2022, Mill Creek's population was lowest in year 2022 at 281.
 
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References
- U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates
 - U.S. Census Bureau Population Estimates Population Estimates Program (PEP)