Overview
          1,186
                  Total Population
                39.8
                  Median age
                49.75%
                  Female population %
                101:100
                  Gender ratio (M:F)
                10-14 years
                  Largest age group
                49.2
                  Total dependency ratio
                White
                  Largest racial group
                4
                  Hispanic population
                Sources: U.S. Census Bureau, American Community Survey (ACS) 2021
TABLE OF CONTENTS
Age
Petersburg's population is old compared to the rest of the country:
- The median age in Petersburg is 39.8, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
 - Petersburg's population under 18 was 25.04%, compared to the 22.51% nationwide.
 - Petersburg's elderly or the senior population (over 65 age) was 12.65% as compared to 16.04% nationwide.
 - Of the total population in Petersburg, 20.32% were under the age of 15, 20.83% aged 15 to 29, 46.21% aged 30 to 64, 11.47% aged 65 to 84, and 1.18% were 85 years of age and older.
 
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Gender
There are 6 less females than males in Petersburg:
- The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 49.75% females and 50.25% males in Petersburg, MI.
 - The Petersburg, MI gender ratio is 101:100 i.e. 101 men to 100 women (1.010).
 - For male population, the largest age group is 10-14 years with a population of 90.
 - For the female population, the largest age group is 50-54 years with a population of 72.
 
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Race / Ethnicity
Petersburg's population is moderately diverse:
- Racial distribution of Petersburg population: 96.63% are White, 1.18% are Black or African American, 0.17% are American Indian and Alaska Native and 2.02% are multiracial.
 - Petersburg's racial breakdown clearly shows that there is an absolute majority of White population in the city.
 - By ethnicity, 4 is Hispanic or Latino (of any race), and 1,146 (96.63% of the total population) is Non-Hispanic.
 - The largest racial group in Petersburg is White with a population of 1,146 (96.63% of the total population).
 
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Year by year
Petersburg's population has already reached its peak and is showing a trend of decline:
- The peak population was 1,170 in the year 2021
 - From 2000 to 2010, Petersburg's population decreased by 23 (1.97%), as compared to the national growth of 9.63%.
 - From 2010 to 2020, Petersburg's population increased by 25 (2.19%), 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, Petersburg's population was lowest in year 2017 at 1,120.
 
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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)