Marion County, Oregon Demographics 2026

Population Overview

Marion County is located in Oregon with a total population of 349,244. It is the 5th most populous county out of 36 in Oregon. The county encompasses 27 Census-designated places.

Age Demographics

The median age in Marion County is 37.5 years. This is 7% lower than the state median of 40.4 years.

Economy, Income & Housing

The median household income in Marion County is $77,351. This is 7% lower than the state median of $83,011. It is also 4% lower than the national median of $80,734. The poverty rate stands at 13.0%. This is 9% higher than the state poverty rate of 11.9%. The unemployment rate is 5.3%. The median home value is $416,400. Housing costs are 13% lower than the state median of $477,600. The home-value-to-income ratio is 5.4x. 62.3% of occupied housing units are owner-occupied. This homeownership rate is 2% lower than the state average of 63.3%.

Race & Ethnicity

The largest racial or ethnic group in Marion County is White (non-Hispanic), making up 60.7% of the population. Hispanic or Latino residents account for 29.0%. The Hispanic or Latino population is significantly higher than the state average (29.0% vs 14.7%). The Asian population (2.0%) is well below the state average of 4.4%.

Education

26.0% of residents aged 25 and older hold a bachelor's degree or higher. This is 29% lower than the state rate of 36.8%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 86.1%.

Data Sources & Methodology

All figures for Marion County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against Oregon and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.