Plymouth County, IA Population

Overview

25,543

Total Population

40.4

Median age

49.68%

Female population %

101.3:100

Gender ratio (M:F)

10-14 years

Largest age group

64.2

Total dependency ratio

White

Largest racial group

1,428

Hispanic population

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

TABLE OF CONTENTS

Age

Plymouth County's population is old compared to the rest of the country:

The median age in Plymouth County is 40.4, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
Plymouth County's population under 18 was 25.22%, compared to the 22.51% nationwide.
Plymouth County's elderly or the senior population (over 65 age) was 18.57% as compared to 16.04% nationwide.
Of the total population in Plymouth County, 20.52% were under the age of 15, 17.36% aged 15 to 29, 43.55% aged 30 to 64, 14.97% aged 65 to 84, and 3.59% were 85 years of age and older.

There are 161 less females than males in Plymouth County:

The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 49.68% females and 50.32% males in Plymouth County, IA.
The Plymouth County, IA gender ratio is 101.3:100 i.e. 101.3 men to 100 women (1.013).
For male population, the largest age group is 60-64 years with a population of 1,053.
For the female population, the largest age group is 10-14 years with a population of 1,039.

Plymouth County's population has become increasingly diverse:

Racial distribution of Plymouth County population: 93.58% are White, 1.71% are Black or African American, 0.51% are American Indian and Alaska Native, 0.40% are Asian, 0.28% are Native Hawaiian and other Pacific Islander, 2.18% are some other race and 1.34% are multiracial.
Plymouth County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
By ethnicity, 1,428 is Hispanic or Latino (of any race), and 24,115 (94.41% of the total population) is Non-Hispanic.
The largest racial group in Plymouth County is White with a population of 23,903 (93.58% of the total population).

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

The peak population was 25,714 in the year 2021
From 2000 to 2010, Plymouth County's population increased by 135 (0.54%), as compared to the national growth of 9.63%.
From 2010 to 2020, Plymouth County's population increased by 711 (2.85%), 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, Plymouth County's population was lowest in year 2009 at 24,315.