which county is monrovia, ca  in
Monrovia is located in south California. Monrovia is part of Los Angeles County. Monrovia has 13.60 square miles of land area and 0.11 square miles of water area. As of 2010, the total Monrovia population is 36,590, which has shrunk 0.92% since 2000. The population growth rate is much lower than the state average rate of 9.99% and is much lower than the national average rate of 9.71%. Monrovia median household income is $69,449 in 2008-2012 and has grown by 53.06% since 2000.