Total Population in Marion County, OR
ACS 2024 5-Year Estimates
349,244
Rank #214/3,222 · #5 in OR
93th
Marion 349,244
OR 4,254,293 -91.8%
US 330M
Total Population Trend
Rankings →Percentile Rank Over Time
Year-over-Year Population Change
National Distribution
How Marion County's total population of 349,244 compares to all 3,222 U.S. counties. Values range from 33 to 9,808,667.
Distribution of Total Population Across All Counties
Ranking Context
Counties ranked closest to Marion County for total population.
Nearby Rankings
Full ranking →| #211 | Westmoreland County, PA | 352,500 |
| #212 | Weld County, CO | 350,396 |
| #213 | Somerset County, NJ | 349,846 |
| #214 | Marion County, OR | 349,244 |
| #215 | Spartanburg County, SC | 347,852 |
| #216 | Rockland County, NY | 341,883 |
| #217 | Cumberland County, NC | 338,545 |
About Total Population
Marion County, Oregon has a total population of 349,244, ranking #214 of 3,222 counties nationwide — 99.9% below the national value of 330M. Within Oregon, it ranks #5 of 36. This places it in the 93th percentile nationally.
Total population count from the American Community Survey. Source: U.S. Census Bureau, American Community Survey 2024 5-Year Estimates. All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.