Middlesex is located in north New Jersey. Middlesex is part of Middlesex County. Middlesex has 3.52 square miles of land area and 0.02 square miles of water area. As of 2010-2014, the total Middlesex population is 13,766, which has grown 0.36% since 2000. The population growth rate is much lower than the state average rate of 5.47% and is much lower than the national average rate of 11.61%. Middlesex median household income is $81,424 in 2010-2014 and has grown by 34.09% since 2000. The income growth rate is higher than the state average rate of 30.67% and is higher than the national average rate of 27.36%. Middlesex median house value is $317,300 in 2010-2014 and has grown by 93.24% since 2000. The house value growth rate is higher than the state average rate of 87.30% and is much 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 Middlesex is close to the state average in quality. The Middlesex area code is 732.