Monrovia is a city in the foothills of the San Gabriel Mountains in the San Gabriel Valley of Los Angeles County, California, United States. The …Monrovia is a city in the foothills of the San Gabriel Mountains in the San Gabriel Valley of Los Angeles County, California, United States. The population was 37,931 at the 2020 census. Monrovia is the fourth-oldest general-law city in Los Angeles County and the L.A. Basin. Incorporated in 1887, it has grown from a sparse community of orange ranches to a residential community of over 37,000.
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