Harford County, MD 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 259.16K Harford County, MD population, the 55-59yrs age group constituted the highest percentage of the total population (7.48%), followed by the 50-54yrs age group (7.32%), and the 60-64yrs age group (7.04%).

In the case of age cohorts, Adults (18-64yrs) constituted the highest percentage of the total population (61.39%), followed by Children (0-17yrs) (22.45%), and Seniors (65yrs and Over) (16.16%).

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.

Data Source: US Census - ACS 5-Year Estimates.

Harford County, MD Percentages of Population By Age Group in 2021

55-59yrs

50-54yrs

60-64yrs

35-39yrs

45-49yrs

5-9yrs

15-19yrs

10-14yrs

30-34yrs

25-29yrs

Harford County, MD Percentages of Population By Age Cohort in 2021

Adults (18-64yrs)

Children (0-17yrs)

Seniors (65yrs and Over)

Harford County, MD Population By Age Group in 2021

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Age Group	Number of People	% of Total
55-59yrs	19381	7.48
50-54yrs	18958	7.32
60-64yrs	18243	7.04
35-39yrs	17578	6.78
45-49yrs	16828	6.49
5-9yrs	16741	6.46
15-19yrs	16423	6.34
10-14yrs	16387	6.32
30-34yrs	16385	6.32
25-29yrs	15575	6.01
40-44yrs	15418	5.95
20-24yrs	14996	5.79
Under 5yrs	14381	5.55
65-69yrs	14352	5.54
70-74yrs	11176	4.31
75-79yrs	7256	2.80
85yrs and Over	4672	1.80
80-84yrs	4412	1.70

Harford County, MD Population By Age Cohort in 2021

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Age Cohort	Number of People	% of Total
Adults (18-64yrs)	159111	61.39
Children (0-17yrs)	58183	22.45
Seniors (65yrs and Over)	41868	16.16