Monrovia
- County:
- Los Angeles County
- County Seat:
- No
- Area (mi²):
- 13.632
- State:
- California
Monrovia is a city located in Los Angeles County, California. Monrovia has a 2026 population of 37,787. Monrovia is currently growing at a rate of 1.34% annually but its population has decreased by -0.56% since the most recent census, which recorded a population of 38,000 in 2020.