General Law city
Incorporated: December 15, 1887
City Hall: 415 South Ivy Ave, Monrovia, California 91016
Population (2020 Census): 37,931 (Also see latest State Population Estimates and Earlier decennial Census Counts).
Population Under Age 18 (2020 Census): 19.4%
Population Density (2020 Census): 2,782.5 persons per square mile
Housing Units: 15,241
Persons Per Housing Unit: 2.5
Land Area: 13.63 square miles (35.31 square kilometers)
Water Area: 0.11 square miles (0.28 square kilometers)
Total Area: 13.74 square miles (35.59 square kilometers)
Geographic Coordinates (Latitude/Longitude): 34.163984 -117.984646
Named for William N. Monroe, a railroad construction engineer who purchased the land and laid out the town in 1886.
City in red below. Click on map for more detailed color map of county.