Marion County, OR Population

Overview

344,037

Total Population

37.0

Median age

49.89%

Female population %

100.4:100

Gender ratio (M:F)

10-14 years

Largest age group

56.4

Total dependency ratio

White

Largest racial group

94,523

Hispanic population

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

TABLE OF CONTENTS

Age

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

The median age in Marion County is 37.0, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
Marion County's population under 18 was 24.55%, compared to the 22.51% nationwide.
Marion County's elderly or the senior population (over 65 age) was 15.67% as compared to 16.04% nationwide.
Of the total population in Marion County, 20.38% were under the age of 15, 20.34% aged 15 to 29, 43.61% aged 30 to 64, 13.85% aged 65 to 84, and 1.82% were 85 years of age and older.

There are 725 less females than males in Marion County:

The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 49.89% females and 50.11% males in Marion County, OR.
The Marion County, OR gender ratio is 100.4:100 i.e. 100.4 men to 100 women (1.004).
For male population, the largest age group is 10-14 years with a population of 12,743.
For the female population, the largest age group is 10-14 years with a population of 11,756.

Marion County's population has become increasingly diverse:

Racial distribution of Marion County population: 75.07% are White, 1.10% are Black or African American, 0.99% are American Indian and Alaska Native, 2.16% are Asian, 1.05% are Native Hawaiian and other Pacific Islander, 9.17% are some other race and 10.47% are multiracial.
Marion County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
By ethnicity, 94,523 is Hispanic or Latino (of any race), and 249,514 (72.53% of the total population) is Non-Hispanic.
The largest racial group in Marion County is White with a population of 258,281 (75.07% of the total population).

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

The peak population was 347,775 in the year 2021
From 2000 to 2010, Marion County's population increased by 30,342 (10.62%), as compared to the national growth of 9.63%.
From 2010 to 2020, Marion County's population increased by 30,391 (9.62%), 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, Marion County's population was lowest in year 2000 at 285,606.