Umatilla County Is Much Younger than Oregon: 2018 Population Estimates by Age and Sex

by Dallas Fridley

June 13, 2019

Population estimates by age and sex, produced by Portland State University’s Population Research Center, detail Umatilla County’s demographic makeup in 2018. Umatilla County’s youth (ages zero to 17) represented one out of four residents in 2018, while at the opposite end of the spectrum, retirement age adults and seniors (age 65 and over) held a 15.2 percent share. Working age adults (age 18 to 64) represented 59.6 percent of Umatilla County’s population, lagging Oregon’s 61.7 percent. Looking at the broad age makeup, Umatilla County’s youth population was significantly larger than Oregon’s, skewing its comparative share of seniors and working age adults.
A more detailed population by age breakout for Umatilla County and Oregon yields essentially the same points. Youth in age groups zero to four years and five to nine years represented a much larger share of Umatilla County’s population. Together, the zero to four and five to nine age groups represented 14.2 percent of Umatilla County’s population, leaving a gap of nearly 3 percentage points compared with Oregon’s 11.4 percent. Youth in the 10 to 14 and 15 to 17 age groups were also overrepresented, holding 10.9 percent of Umatilla County’s population, relative to Oregon’s 9.3 percent. Umatilla County made up for these differences by having a comparatively lower share of its population across all age groups age 30 and above.
Males outnumber females in Umatilla County by a fairly wide margin, with 52.7 percent of its population male and 47.3 percent female. Females held an advantage of 0.7 percent statewide, representing 50.7 percent of Oregon’s 2018 population. Umatilla was one of 11 counties in Oregon where males outnumbered females. Surprising or perhaps expected, all 11 counties where males held an advantage were rural.

In Umatilla County, females led all age groups 75 and above. In the 85+ age group, females held a 61.7 percent share, while in the 80 to 84 age group females represented 54.1 percent of the county’s population. Females also held an advantage statewide in these senior age groups, but the margins were somewhat wider. Females led just one age groups under age 65, with youth age five to nine holding a 51.1 percent advantage. The widest margin was seen in the 25 to 29 age group where males comprised 56.7 percent of Umatilla County’s population, a considerably higher share than Oregon’s 50.3 percent.


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