Mount Vernon
- County:
- Grant County
- County Seat:
- No
- Area (mi²):
- 0.683
- State:
- Oregon
Mount Vernon is a city located in Grant County, Oregon. Mount Vernon has a 2026 population of 547. Mount Vernon is currently declining at a rate of -1.44% annually and its population has decreased by -0.36% since the most recent census, which recorded a population of 549 in 2020.