Decatur County, IA Population

Overview

7,718

Total Population

35.9

Median age

49.29%

Female population %

102.9:100

Gender ratio (M:F)

20-24 years

Largest age group

62.3

Total dependency ratio

White

Largest racial group

255

Hispanic population

Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

TABLE OF CONTENTS

Age

Decatur County's population is young compared to the rest of the country:

The median age in Decatur County is 35.9, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
Decatur County's population under 18 was 21.82%, compared to the 22.51% nationwide.
Decatur County's elderly or the senior population (over 65 age) was 20.06% as compared to 16.04% nationwide.
Of the total population in Decatur County, 18.35% were under the age of 15, 25.27% aged 15 to 29, 36.33% aged 30 to 64, 17.34% aged 65 to 84, and 2.72% were 85 years of age and older.

There are 110 less females than males in Decatur County:

The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 49.29% females and 50.71% males in Decatur County, IA.
The Decatur County, IA gender ratio is 102.9:100 i.e. 102.9 men to 100 women (1.029).
For male population, the largest age group is 20-24 years with a population of 494.
For the female population, the largest age group is 20-24 years with a population of 395.

Decatur County's population has become increasingly diverse:

Racial distribution of Decatur County population: 93.65% are White, 1.55% are Black or African American, 0.06% are American Indian and Alaska Native, 0.73% are Asian, 0.19% are Native Hawaiian and other Pacific Islander, 0.62% are some other race and 3.19% are multiracial.
Decatur County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
By ethnicity, 255 is Hispanic or Latino (of any race), and 7,463 (96.70% of the total population) is Non-Hispanic.
The largest racial group in Decatur County is White with a population of 7,228 (93.65% of the total population).

Decatur County's population has already reached its peak and is showing a trend of decline:

The peak population was 8,634 in the year 2000
From 2000 to 2010, Decatur County's population decreased by 215 (2.49%), as compared to the national growth of 9.63%.
From 2010 to 2020, Decatur County's population decreased by 814 (9.67%), 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, Decatur County's population was lowest in year 2020 at 7,605.