Lexington County, SC population age distribution
A complete breakdown of Lexington 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 | 16,577 | 5.68% |
5 to 9 years | 18,608 | 6.38% |
10 to 14 years | 20,474 | 7.02% |
15 to 19 years | 18,218 | 6.24% |
20 to 24 years | 15,716 | 5.39% |
25 to 29 years | 19,190 | 6.58% |
30 to 34 years | 19,590 | 6.72% |
35 to 39 years | 20,545 | 7.04% |
40 to 44 years | 17,691 | 6.06% |
45 to 49 years | 19,514 | 6.69% |
50 to 54 years | 19,737 | 6.77% |
55 to 59 years | 19,577 | 6.71% |
60 to 64 years | 19,762 | 6.77% |
65 to 69 years | 15,576 | 5.34% |
70 to 74 years | 13,271 | 4.55% |
75 to 79 years | 7,762 | 2.66% |
80 to 84 years | 5,013 | 1.72% |
85 years and over | 4,902 | 1.68% |
TABLE OF CONTENTS
Lexington County, SC population by age group
Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

The largest age group in Lexington County, SC was for the group of age 35-39 years with a population of 20,545 (7.04%), according to the 2021 American Community Survey.
At the same time, the smallest age group in Lexington County, SC was the 85+ years with a population of 4,902 (1.68%).
Lexington County, SC population by age cohort
To better understand the age distribution of Lexington County, SC'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 | 67,785 | 23.24% |
18 to 64 years | 177,414 | 60.82% |
85 years and over | 46,524 | 15.95% |
Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:
- Lexington County's population under 18 was 23.24%, compared to the 22.51% nationwide.
- Lexington County's working population (between 18 and 64) was 60.82%, compared to 61.45% nationwide.
- Lexington County's elderly or the senior population (over 65 age) was 15.95% as compared to 16.04% nationwide.
Lexington County, SC population pyramid
Population pyramid for Lexington County, SC 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 Lexington County's population pyramid:
- Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Lexington County, SC, is 29.4.
- Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Lexington County, SC, is 24.5.
- Total dependency ratio for Lexington County, SC is 53.9.
- Potential support ratio, which is the number of youth (working age population) per elderly, for Lexington County, SC is 4.1.

Here's the Lexington County, SC's male and female population across different age groups:
Age Group | Population(Male) | Population(Female) | Total Population |
---|---|---|---|
Under 5 years | 8,450 | 8,127 | 16,577 |
5 to 9 years | 9,600 | 9,008 | 18,608 |
10 to 14 years | 10,395 | 10,079 | 20,474 |
15 to 19 years | 9,358 | 8,860 | 18,218 |
20 to 24 years | 7,957 | 7,759 | 15,716 |
25 to 29 years | 9,354 | 9,836 | 19,190 |
30 to 34 years | 9,628 | 9,962 | 19,590 |
35 to 39 years | 9,488 | 11,057 | 20,545 |
40 to 44 years | 9,165 | 8,526 | 17,691 |
45 to 49 years | 9,585 | 9,929 | 19,514 |
50 to 54 years | 9,849 | 9,888 | 19,737 |
55 to 59 years | 9,659 | 9,918 | 19,577 |
60 to 64 years | 9,370 | 10,392 | 19,762 |
65 to 69 years | 7,043 | 8,533 | 15,576 |
70 to 74 years | 6,419 | 6,852 | 13,271 |
75 to 79 years | 3,612 | 4,150 | 7,762 |
80 to 84 years | 2,022 | 2,991 | 5,013 |
85 years and over | 1,808 | 3,094 | 4,902 |
Things to know
What is the population of Lexington County, SC under 18?
Lexington County's population under the age of 18 is 67,785, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 23.24% of the total resident population of Lexington County, SC.
What is the aging population in Lexington County, SC?
Lexington County's population aged 65 years and above was 46,524. As per the U.S. Census Bureau's American Community Survey, this population is 15.95% of the entire population.
References
- U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates