Overview
17,173
Total Population
47.1
Median age
49.48%
Female population %
102.1:100
Gender ratio (M:F)
60-64 years
Largest age group
70.9
Total dependency ratio
White
Largest racial group
359
Hispanic population
Sources: U.S. Census Bureau, American Community Survey (ACS) 2021
TABLE OF CONTENTS
Age
Clayton County's population is old compared to the rest of the country:
- The median age in Clayton County is 47.1, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
- Clayton County's population under 18 was 21.73%, compared to the 22.51% nationwide.
- Clayton County's elderly or the senior population (over 65 age) was 23.37% as compared to 16.04% nationwide.
- Of the total population in Clayton County, 18.13% were under the age of 15, 15.40% aged 15 to 29, 43.10% aged 30 to 64, 19.52% aged 65 to 84, and 3.85% were 85 years of age and older.

Read more about Clayton County, IA population by age ➔
Gender
There are 177 less females than males in Clayton County:
- The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 49.48% females and 50.52% males in Clayton County, IA.
- The Clayton County, IA gender ratio is 102.1:100 i.e. 102.1 men to 100 women (1.021).
- For male population, the largest age group is 60-64 years with a population of 787.
- For the female population, the largest age group is 60-64 years with a population of 798.

Read more about Clayton County, IA population by gender ➔
Race / Ethnicity
Clayton County's population has become increasingly diverse:
- Racial distribution of Clayton County population: 96.63% are White, 0.29% are Black or African American, 0.08% are American Indian and Alaska Native, 0.31% are Asian, 0.41% are some other race and 2.29% are multiracial.
- Clayton County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
- By ethnicity, 359 is Hispanic or Latino (of any race), and 16,814 (97.91% of the total population) is Non-Hispanic.
- The largest racial group in Clayton County is White with a population of 16,594 (96.63% of the total population).

Read more about Clayton County, IA population by race ➔
Year by year
Clayton County's population has already reached its peak and is showing a trend of decline:
- The peak population was 18,595 in the year 2000
- From 2000 to 2010, Clayton County's population decreased by 515 (2.77%), as compared to the national growth of 9.63%.
- From 2010 to 2020, Clayton County's population decreased by 1,050 (5.81%), according to Census Bureau's Population Estimates Program. For the same period, the rate of growth for the United States was 7.17%.
- Between the year 2000 and 2022, Clayton County's population was lowest in year 2022 at 17,027.

Read more about Clayton County, IA population by year ➔
References
- U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates
- U.S. Census Bureau Population Estimates Population Estimates Program (PEP)