East Orange is a city in Essex County, New Jersey, United States. As of the 2010 United States Census the city's population was 64,270, reflecting a decline of 5,554 (-8.0%) from the 69,824 counted in the 2000 Census, which had in turn declined by 3,728 (-5.1%) from the 73,552 counted in the 1990 Census. The city was the state's 20th most-populous municipality in 2010, after having been the state's 14th most-populous municipality in 2000.