– Monrovia is a city located in the foothills of the San Gabriel Mountains in the San Gabriel Valley of Los Angeles County, California, United States. The population was 36,590 at the 2010 census, down from 36,929 at the 2000 census. Monrovia has been used for filming TV shows, movies and commercials.
City: Monrovia
State: California
Zip Code: 91016