Gilliam County's 2026 population is estimated at 1,843, reflecting a -3.36% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Gilliam County is the 35th largest county in Oregon. The 2010 population was 1,880 and has grown -1.97% since 2010.
Data after 2023 is projected based on recent change
Overall: 50.1 years
Female: 53.2 years
Male: 43.5 years
There are 1,596 adults, (639 of whom are seniors) in Gilliam County.
Female: 918 (46.6%)
Male: 1,053 (53.4%)
The racial composition of Gilliam County includes 81.28% White, and smaller percentages for Native American, other race and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 1,602 | 81.28% |
| Two or more races | 315 | 15.98% |
| Native American | 32 | 1.62% |
| Other race | 22 | 1.12% |
Gilliam County 's average per capita income is $51,042. Household income levels show a median of $66,917. The poverty rate stands at 15.25%.
| Name | Median ↓ | Mean |
|---|---|---|
| Families | $90,865 | $103,594 |
| Married Families | $89,444 | - |
| Households | $66,917 | $81,672 |
| Non Families | $32,813 | $51,939 |
Average Income
Median Household Income
Poverty Rate
