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.
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
Housing cost is the defining feature of Marion County: the median home is valued at $383,300. With 346,532 residents, Marion County is a county in Oregon. It is the #5-largest of all counties in Oregon nationally.
Households take in a median $74,624, comfortably near the US median of $78,538. The poverty rate is 9.3%, below the national 12.4%. Real estate commands a premium here — a median home value of $383,300, with typical rent around $1,333.
Degree attainment is mid-range for US counties: 26.0% of adults hold a four-year degree, below the national 35.0%. A solid 11.7% of workers are based at home, below the national 14.0%, and the average commute runs about 24 minutes each way.
High housing values reframe the income picture in Marion County — even solid earnings stretch less against home prices and rents at this level.
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 |
|---|---|
| 2010 | 315,948 |
| 2011 | 318,053 |
| 2012 | 319,865 |
| 2013 | 321,491 |
| 2014 | 324,473 |
| 2015 | 329,106 |
| 2016 | 335,592 |
| 2017 | 340,846 |
| 2018 | 345,512 |
| 2019 | 347,557 |
| 2020 | 346,305 |
| 2021 | 347,784 |
| 2022 | 349,388 |
| 2023 | 349,874 |
| 2024 | 352,867 |
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
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
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
Other counties in Oregon
Part of Oregon
Metro areas in Oregon
County 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.
Marion County, OR Climate
Marion County, OR has an average annual temperature of 8.8°C (48°F) and receives about 2245 mm of precipitation per year. The warmest month is August and the coldest is December. Figures are 1970–2000 climate normals.
8.8°C
Avg Temp
2245
Precip (mm/yr)
Aug
Hottest Month
Dec
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | 3° / 38° | 334 mm |
| February | 4° / 39° | 254 mm |
| March | 5° / 41° | 251 mm |
| April | 7° / 44° | 173 mm |
| May | 10° / 49° | 128 mm |
| June | 13° / 55° | 85 mm |
| July | 16° / 60° | 30 mm |
| August | 16° / 61° | 46 mm |
| September | 14° / 57° | 94 mm |
| October | 10° / 50° | 166 mm |
| November | 5° / 41° | 328 mm |
| December | 3° / 38° | 356 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Marion County, OR
The most comfortable months to visit Marion County, OR are typically July, August and September, when temperatures are mildest and rainfall is relatively low. The hottest month is August (around 23°C high). The coldest is December (near 0°C low). December is usually the wettest month.
Where to stay near Marion County
Visiting or relocating to Marion County, OR? Compare hotels and short-term rentals across the county — live availability and prices.
Top-rated places to stay near Marion County
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a move to Marion County?
Get relocation and cost-of-living insights for Marion County, OR by email. No spam, unsubscribe anytime.
More from Oregon
Population 803,863
Population 600,266
Population 422,308
Population 382,628
Full rankings of Oregon counties
Statewide data for Oregon
Population, race, income, age, and trends across Oregon
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.