Marion County, Oregon Population 2026

Updated April 2026 · US Census ACS 2023 5-Year Estimates · 5th-largest in Oregon

The population of Marion County, Oregon is 346,532 as of the 2023 American Community Survey, making it the 5th-largest county in Oregon. The median household income is $74,624, the median home value is $383,300, and the median age is 37.2.

The population of Marion County has grown 11.7% since 2010 (315,948 → 352,867), a +0.79% annualized rate.

Marion County within Oregon · Source: US Census TIGER/Line via us-atlas

346,532

Population

+0.79%

Annual growth

293

People / sq mi

$74,624

Median Income

$383,300

Median Home Value

Marion County covers 1,181 sq mi of land at 293.5 people per square mile.

About Marion County, OR

Marion County is a county in Oregon with a population of 346,532. It ranks #5 among counties in Oregon by population. The median age is 37.2, younger than the national median. The population is 50.1% male and 49.9% female.

The median household income in Marion County is $74,624, near the US median of $74,580. 9.3% of residents live below the federal poverty level. Home values sit at a median of $383,300, with monthly rent averaging $1,333. The homeownership rate of 62.2% is lower than the national rate of 64.8%.

Educational attainment in Marion County reflects 26.0% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 11.7% of workers primarily work from home, similar to the national work-from-home rate of 14.2%. The average commute is 24.1 minutes each way.

Marion County Population History (2010-2024)

The county of Marion County had a population of 315,948 in 2010 and 352,867 in 2024, a 11.7% growth over 14 years. The peak was 352,867 in 2024. Average annual growth rate: 0.79%.

352,867

Population (2024)

315,948

Population (2010)

352,867

Peak (2024)

0.79%

Avg Annual Growth

Year	Population	Change	Annual %	Source
2010	315,948	-	-	estimate
2011	318,053	+2,105	+0.67%	estimate
2012	319,865	+1,812	+0.57%	estimate
2013	321,491	+1,626	+0.51%	estimate
2014	324,473	+2,982	+0.93%	estimate
2015	329,106	+4,633	+1.43%	estimate
2016	335,592	+6,486	+1.97%	estimate
2017	340,846	+5,254	+1.57%	estimate
2018	345,512	+4,666	+1.37%	estimate
2019	347,557	+2,045	+0.59%	estimate
2020	346,305	-1,252	-0.36%	estimate
2021	347,784	+1,479	+0.43%	estimate
2022	349,388	+1,604	+0.46%	estimate
2023	349,874	+486	+0.14%	estimate
2024	352,867	+2,993	+0.86%	estimate

Race & Ethnicity

White	69.2%
Black or African American	1.1%
Asian	0.0%
Hispanic or Latino (any race)	5.2%
Two or More Races	0.0%

Age & Sex

37.2

Median Age

49.9%

Female

50.1%

Male

16.4%

Age 65+

Age Distribution

Under 5

6.0%

5–9

6.7%

10–14

6.9%

15–19

7.0%

20–24

6.4%

25–34

14.0%

35–44

13.2%

45–54

11.7%

55–59

5.7%

60–64

6.0%

65–74

9.9%

75–84

4.6%

85+

1.9%

Children (under 15): 19.6% · Seniors (65+): 16.4%

Income & Poverty

Median household income	$74,624$-5,802 vs state
Mean household income	$95,954
Per-capita income	$35,452
Poverty rate	9.3%+2.0% vs state
Unemployment rate	3.2%
Employment-to-population	58.3%

Top Industries by Employment

Professional & business services

22.3%

Manufacturing

9.6%

Construction

9.2%

Finance & real estate

8.9%

Education & health care

8.6%

Public administration

8.5%

Information

5.1%

Agriculture

5.0%

The largest employment sector in Marion County is professional & business services, accounting for 22.3% of workers.

How residents commute

1.3%

Drive alone

2.3%

Carpool

71.4%

Public transit

11.7%

Work from home

24.1 min

Avg commute

Housing

$383,300$-70,900 vs state

Median home value

$1,333

Median rent

62.2%

Homeownership rate

130,600

Total housing units

96.0%

Occupied

4.0%

Vacant

37.8%

Renter-occupied

Social & access

91.3%

With health insurance

96.0%

With broadband internet

33.1%

Foreign-born

7.1%

Veterans (18+)

15.6%

With a disability

74.7%

Speak language other than English at home

Education

86.1%

High School+

26.0%

Bachelor's+

Largest cities in Oregon

Portland (642,715)Eugene (177,520)Salem (176,666)Gresham (112,818)Hillsboro (107,050)Bend (101,472)Beaverton (97,502)Medford (85,794)Springfield (61,642)Corvallis (60,424)All Oregon cities →

Other counties in Oregon

Multnomah County (803,863)Washington County (600,266)Clackamas County (422,308)Lane County (382,628)Jackson County (222,563)Deschutes County (203,026)Linn County (129,794)Douglas County (111,807)Yamhill County (108,122)Benton County (96,359)All Oregon counties →

Part of Oregon

Oregon demographic profile All Oregon data →

Metro areas in Oregon

Portland (2,510,529)Salem (435,085)Eugene (382,628)Bend (253,650)Medford (222,563)Albany (129,794)Corvallis (96,359)Grants Pass (88,069)All US metros →

County rankings

US Counties by Population Richest US Counties by Median Household Income Expensive US Counties by Home Value Educated US Counties Counties With Highest Poverty Rates Youngest US Counties by Median Age Oldest US Counties by Median Age Cheapest US Counties by Median Home Value Racially Diverse US Counties Counties With Largest Hispanic Population All rankings →

Frequently Asked Questions

Marion County, Oregon has a population of 346,532 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 5th-largest county in Oregon. Population density is 293 people per square mile.

The population of Marion County has grown 11.7% since 2010 (315,948 → 352,867), a +0.79% annualized rate.

The median household income in Marion County, Oregon is $74,624, with mean (average) household income of $95,954 and per-capita income of $35,452. 9.3% of residents live below the federal poverty level.

In Marion County, the largest racial and ethnic groups are White (69.2%), Hispanic or Latino (5.2%), Black or African American (1.1%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.

The median age in Marion County, Oregon is 37.2 years. Residents are 49.9% female and 50.1% male.

The median home value in Marion County is $383,300 and median monthly rent is $1,333. 62.2% of occupied housing units are owner-occupied. The county has 130,600 total housing units, 4.0% of which are vacant.

The largest employment sector in Marion County, Oregon is professional, scientific, and management services, employing 22.3% of workers. The unemployment rate is 3.2%.

Portland is among the largest cities associated with Marion County, Oregon, with a population of 642,715.