Gilliam County, Oregon Cities (2025)

3 cities

City
Rank
2025 Pop. ↓
2020 Pop.
Change
Density
Area (mi²)
Type
Condon17187180%8810.81 City
Arlington26436330.31%2522.55 City
Lonerock323230%231.01 City

Gilliam County Cities Summary

Largest City

Condon is the largest city in Gilliam County, with a population of 718.

Smallest City

Lonerock is the smallest city in Gilliam County.

10 Largest Cities

There are 3 cities in Gilliam County, Oregon.