Montgomery County, MD Population By Age Group and Age Cohort in 2021 (ACS-5Yrs)
Based on the US Census ACS-5Yrs estimates, in 2021, among the 1.06M Montgomery County, MD population, the 35-39yrs age group constituted the highest percentage of the total population (7.12%), followed by the 50-54yrs age group (6.99%), and the 55-59yrs age group (6.95%).
In the case of age cohorts, Adults (18-64yrs) constituted the highest percentage of the total population (61.08%), followed by Children (0-17yrs) (23.30%), and Seniors (65yrs and Over) (15.62%).
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 see similar information for other Maryland counties, and for Maryland.
| Age Group | Number of People | % of Total |
|---|---|---|
| 35-39yrs | 75318 | 7.12 |
| 50-54yrs | 73906 | 6.99 |
| 55-59yrs | 73487 | 6.95 |
| 45-49yrs | 72628 | 6.87 |
| 10-14yrs | 72318 | 6.84 |
| 40-44yrs | 71282 | 6.74 |
| 30-34yrs | 68986 | 6.53 |
| 5-9yrs | 66910 | 6.33 |
| 60-64yrs | 66449 | 6.29 |
| 15-19yrs | 65908 | 6.23 |
| Under 5yrs | 64174 | 6.07 |
| 25-29yrs | 62015 | 5.87 |
| 20-24yrs | 58724 | 5.56 |
| 65-69yrs | 55005 | 5.20 |
| 70-74yrs | 40708 | 3.85 |
| 75-79yrs | 28615 | 2.71 |
| 85yrs and Over | 21812 | 2.06 |
| 80-84yrs | 18956 | 1.79 |
| Age Cohort | Number of People | % of Total |
|---|---|---|
| Adults (18-64yrs) | 645747 | 61.08 |
| Children (0-17yrs) | 246358 | 23.30 |
| Seniors (65yrs and Over) | 165096 | 15.62 |
