Overview
          1,106
                  Total Population
                51.3
                  Median age
                49.82%
                  Female population %
                100.7:100
                  Gender ratio (M:F)
                60-64 years
                  Largest age group
                77.2
                  Total dependency ratio
                White
                  Largest racial group
                39
                  Hispanic population
                Sources: U.S. Census Bureau, American Community Survey (ACS) 2021
TABLE OF CONTENTS
Age
Marcus's population is old compared to the rest of the country:
- The median age in Marcus is 51.3, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
 - Marcus's population under 18 was 13.92%, compared to the 22.51% nationwide.
 - Marcus's elderly or the senior population (over 65 age) was 31.65% as compared to 16.04% nationwide.
 - Of the total population in Marcus, 11.93% were under the age of 15, 15.91% aged 15 to 29, 40.51% aged 30 to 64, 22.42% aged 65 to 84, and 9.22% were 85 years of age and older.
 
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Gender
There are 4 less females than males in Marcus:
- The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 49.82% females and 50.18% males in Marcus, IA.
 - The Marcus, IA gender ratio is 100.7:100 i.e. 100.7 men to 100 women (1.007).
 - For male population, the largest age group is 40-44 years with a population of 92.
 - For the female population, the largest age group is 85+ years with a population of 78.
 
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Race / Ethnicity
Marcus's population is moderately diverse:
- Racial distribution of Marcus population: 84.81% are White, 10.67% are Black or African American, 0.99% are some other race and 3.53% are multiracial.
 - Marcus's racial breakdown clearly shows that there is an absolute majority of White population in the city.
 - By ethnicity, 39 is Hispanic or Latino (of any race), and 1,067 (96.47% of the total population) is Non-Hispanic.
 - The largest racial group in Marcus is White with a population of 938 (84.81% of the total population).
 
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Year by year
Marcus's population has already reached its peak and is showing a trend of decline:
- The peak population was 1,134 in the year 2000
 - From 2000 to 2010, Marcus's population decreased by 15 (1.32%), as compared to the national growth of 9.63%.
 - From 2010 to 2020, Marcus's population decreased by 44 (3.93%), 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, Marcus's population was lowest in year 2009 at 1,022.
 
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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)