Keizer
- County:
- Marion County
- County Seat:
- No
- Area (mi²):
- 7.185
- State:
- Oregon
Keizer is a city located in Marion County, Oregon. Keizer has a 2026 population of 39,152. Keizer is currently growing at a rate of 0.75% annually but its population has decreased by -0.44% since the most recent census, which recorded a population of 39,325 in 2020.