Marion County Population 2018

Marion County's estimated population is 341,286 with a growth rate of 1.64% in the past year according to the most recent United States census data. Marion County is the 5th largest county in Oregon.

Year Population Growth Growth Rate
2017341,2865,5201.64%
2016335,7666,4311.95%
2015329,3354,8741.50%
2014324,4613,0430.95%
2013321,4181,8150.57%
2012319,6031,9690.62%
2011317,6341,7210.54%
2010315,91387,43038.27%
1990228,48323,79111.62%
1980204,69253,38335.28%
1970151,30930,42125.16%
1960120,88819,48719.22%
1950101,40126,15534.76%
194075,24614,70524.29%
193060,54113,35428.30%
192047,1877,40718.62%
191039,78012,06743.54%
190027,7134,77920.84%
189022,9348,35857.34%
188014,5764,61146.27%
18709,9652,87740.59%
18607,0884,339157.84%
18502,7490.00%

Marion County Population Growth

Population Data via

Marion County Race Data

Race Population Percentage
White295,24686.51%
Two or More Races10,8973.19%
American Indian and Alaska Native8,4432.47%
Asian7,5332.21%
Black or African American4,5921.35%
Native Hawaiian and Other Pacific Islander3,2360.95%

Marion County Population Pyramid

0k2k4k6k8k10k12k Male Population0k2k4k6k8k10k12k Female Population8580757065605550454035302520151050
Data Sources
  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990