St. Petersburg city, FL Population By Age Group and Age Cohort in 2021 (ACS-5Yrs)

Updated on February 28, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, among the 258.25K St. Petersburg city, FL population, the 55-59yrs age group constituted the highest percentage of the population (7.87%), followed by the 30-34yrs age group (7.85%), and the 25-29yrs age group (7.72%).

In the case of age cohorts, Adults (18-64yrs) constituted the highest percentage of the total population (63.63%), followed by Seniors (65yrs and Over) (19.28%), and Children (0-17yrs) (17.10%).

The first and second charts below shows the percentage of the population by age group and age cohort respectively. The table below also shows the number and percentages for each age group and age cohort.

You can also see similar information for other Florida cities and places, and for Florida.

Data Source: US Census Bureau.
St. Petersburg city, FL Percentages of Population By Age Group in 2021
55-59yrs
30-34yrs
25-29yrs
60-64yrs
50-54yrs
35-39yrs
65-69yrs
40-44yrs
45-49yrs
20-24yrs
St. Petersburg city, FL Percentages of Population By Age Cohort in 2021
Adults (18-64yrs)
Seniors (65yrs and Over)
Children (0-17yrs)
St. Petersburg city, FL Population By Age Group in 2021
0 of 0
Age Group Number of People % of Total
55-59yrs 20310 7.87
30-34yrs 20267 7.85
25-29yrs 19927 7.72
60-64yrs 19005 7.36
50-54yrs 18108 7.01
35-39yrs 16095 6.23
65-69yrs 15898 6.16
40-44yrs 15835 6.13
45-49yrs 15279 5.92
20-24yrs 14438 5.59
70-74yrs 13263 5.14
Under 5yrs 12748 4.94
5-9yrs 12666 4.91
15-19yrs 11922 4.62
10-14yrs 11863 4.59
75-79yrs 8988 3.48
85yrs and Over 5914 2.29
80-84yrs 5719 2.22
St. Petersburg city, FL Population By Age Cohort in 2021
0 of 0
Age Cohort Number of People % of Total
Adults (18-64yrs) 164313 63.63
Seniors (65yrs and Over) 49782 19.28
Children (0-17yrs) 44150 17.10