Middletown Township is a township in Monmouth County, New Jersey, United States. As of the 2010 United States Census, the township had a total population of 66,522, making it the state's 16th largest municipality, having seen an increase of 195 residents (0.3%) from its population of 66,327 in the 2000 Census, when it was the state's 17th most populous municipality, which had in turn declined by 1,856 (-2.7%) from the 68,183 counted in the 1990 Census. Middletown is one of the oldest sites of European settlement in New Jersey.
Middletown Township was originally formed on October 31, 1693, and was incorporated as a township by an Act of the New Jersey Legislature on February 21, 1798. Portions of the township were taken to form Atlantic Township (February 8, 1847, now Colts Neck Township), Raritan Township (February 25, 1848, now Hazlet Township), Atlantic Highlands (February 28, 1887), Highlands (March 22, 1900) and Keansburg (March 22, 1917).
Due to its affluence, low crime, access to cultural activities, public school system, and central commuting location, Middletown was ranked in 2006, 2008, and 2010, and 2014 Top 100 in CNNMoney.com's Best Places to Live. Time magazine listed Middletown on its list of "Best Places to Live 2014"