Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Cedar Grove Township is a Township in north central Essex County, New Jersey, United States. As of the United States 2000 Census, the township population was 12,300. In 2006, the population went up to 12,848.What is now Cedar Grove was originally incorporated by an Act of the New Jersey Legislature as the Township of Verona on February 7, 1892, from portions of Caldwell Township. Portions of the township were taken to create Verona borough, based on the results of a referendum held on April 30, 1907. On April 9, 1908, the name was formally changed to Cedar Grove.