Parsippany-Troy Hills Township, commonly called simply Parsippany (), is a township in Morris County, New Jersey, United States. As of the 2010 United States Census, the township's population was 53,238, reflecting an increase of 2,589 (+5.1%) from the 50,649 counted in the 2000 Census, which had in turn increased by 2,171 (+4.5%) from the 48,478 counted in the 1990 Census.The name Parsippany comes from the Lenape Native American sub-tribe, which comes from the word parsipanong, which means "the place where the river winds through the valley". Parsippany-Troy Hills is the most populous municipality in Morris County. The name Troy Hills was changed from Troy, to avoid confusion of mail being sent erroneously to Troy, New York.Parsippany-Troy Hills was incorporated as a township by an act of the New Jersey Legislature on March 12, 1928, from portions of Hanover Township, based on the results of a referendum held on May 9, 1928, that split off both East Hanover Township and Parsippany-Troy Hills from Hanover Township.Since 2006. Parsippany-Troy Hills has been consistently recognized by Money magazine as one of the Best Places to Live in the United States. That year Parsippany was ranked 17th on the list, the highest-ranked location in New Jersey. In 2008, it moved up to 13th position. Parsippany returned to Money magazine's "Best Places" list in 2012, in the 15th position, and again in 2014, where it ranked 16th with Money citing its "Arts and leisure". Parsippany's ranking improved to the 5th-ranked position on the "Best Places" list in 2016, but in 2017 dropped to 33rd. In 2018, Parsippany again made the list, at the 23rd-ranked position.
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