Macomb County, MI population age distribution
A complete breakdown of Macomb County's age demographics from 0 to 85 years, distributed across 18 age groups is listed in the table below.
Age Group | Population | % of Total Population |
---|---|---|
Under 5 years | 47,657 | 5.42% |
5 to 9 years | 50,413 | 5.73% |
10 to 14 years | 53,392 | 6.07% |
15 to 19 years | 52,558 | 5.98% |
20 to 24 years | 52,148 | 5.93% |
25 to 29 years | 62,152 | 7.07% |
30 to 34 years | 56,373 | 6.41% |
35 to 39 years | 54,085 | 6.15% |
40 to 44 years | 51,990 | 5.91% |
45 to 49 years | 58,483 | 6.65% |
50 to 54 years | 62,985 | 7.16% |
55 to 59 years | 64,522 | 7.34% |
60 to 64 years | 63,005 | 7.17% |
65 to 69 years | 49,018 | 5.58% |
70 to 74 years | 39,225 | 4.46% |
75 to 79 years | 24,980 | 2.84% |
80 to 84 years | 17,063 | 1.94% |
85 years and over | 19,074 | 2.17% |
TABLE OF CONTENTS
Macomb County, MI population by age group
Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

The largest age group in Macomb County, MI was for the group of age 55-59 years with a population of 64,522 (7.34%), according to the 2021 American Community Survey.
At the same time, the smallest age group in Macomb County, MI was the 80-84 years with a population of 17,063 (1.94%).
Macomb County, MI population by age cohort
To better understand the age distribution of Macomb County, MI's population, we divided it into the following 3 cohorts:
- Children : Under the age of 18 years
- Adults (working population): Between the age of 18 and 64 years
- Seniors: 65 years and above

Here's the population for each of the three cohorts.
Age Group | Population | % of Total Population |
---|---|---|
Under 18 years | 185,810 | 21.14% |
18 to 64 years | 543,953 | 61.87% |
85 years and over | 149,360 | 16.99% |
Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:
- Macomb County's population under 18 was 21.14%, compared to the 22.51% nationwide.
- Macomb County's working population (between 18 and 64) was 61.87%, compared to 61.45% nationwide.
- Macomb County's elderly or the senior population (over 65 age) was 16.99% as compared to 16.04% nationwide.
Macomb County, MI population pyramid
Population pyramid for Macomb County, MI is charted below using the estimates from U.S. Census Bureau's American Community Survey 5-Year estimates. A wide base suggests population increase, narrow base indicates declining birth rates.
Key stats from our analysis of the Macomb County's population pyramid:
- Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Macomb County, MI, is 26.2.
- Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Macomb County, MI, is 25.8.
- Total dependency ratio for Macomb County, MI is 52.0.
- Potential support ratio, which is the number of youth (working age population) per elderly, for Macomb County, MI is 3.9.

Here's the Macomb County, MI's male and female population across different age groups:
Age Group | Population(Male) | Population(Female) | Total Population |
---|---|---|---|
Under 5 years | 24,507 | 23,150 | 47,657 |
5 to 9 years | 25,498 | 24,915 | 50,413 |
10 to 14 years | 27,706 | 25,686 | 53,392 |
15 to 19 years | 27,194 | 25,364 | 52,558 |
20 to 24 years | 26,326 | 25,822 | 52,148 |
25 to 29 years | 31,145 | 31,007 | 62,152 |
30 to 34 years | 28,349 | 28,024 | 56,373 |
35 to 39 years | 26,604 | 27,481 | 54,085 |
40 to 44 years | 25,825 | 26,165 | 51,990 |
45 to 49 years | 28,802 | 29,681 | 58,483 |
50 to 54 years | 30,925 | 32,060 | 62,985 |
55 to 59 years | 31,507 | 33,015 | 64,522 |
60 to 64 years | 30,826 | 32,179 | 63,005 |
65 to 69 years | 23,707 | 25,311 | 49,018 |
70 to 74 years | 17,566 | 21,659 | 39,225 |
75 to 79 years | 10,798 | 14,182 | 24,980 |
80 to 84 years | 6,842 | 10,221 | 17,063 |
85 years and over | 6,547 | 12,527 | 19,074 |
Things to know
What is the population of Macomb County, MI under 18?
Macomb County's population under the age of 18 is 185,810, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 21.14% of the total resident population of Macomb County, MI.
What is the aging population in Macomb County, MI?
Macomb County's population aged 65 years and above was 149,360. As per the U.S. Census Bureau's American Community Survey, this population is 16.99% of the entire population.
References
- U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates