Willowbrook is located in south California. Willowbrook has 3.76 square miles of land area and 0.01 square miles of water area. As of 2010-2014, the total Willowbrook population is 20,897, which has shrunk 38.79% since 2000. The population growth rate is much lower than the state average rate of 12.39% and is much lower than the national average rate of 11.61%. Willowbrook median household income is $37,760 in 2010-2014 and has grown by 35.77% since 2000. The income growth rate is higher than the state average rate of 29.47% and is higher than the national average rate of 27.36%. Willowbrook median house value is $226,000 in 2010-2014 and has grown by 69.29% since 2000. The house value growth rate is lower than the state average rate of 75.60% and is higher than the national average rate of 46.91%. As a reference, the national Consumer Price Index (CPI) inflation rate for the same period is 26.63%. On average, the public school district that covers Willowbrook is worse than the state average in quality.