East Orange is a city in Essex County, in the U.S. state of New Jersey. As of the 2020 United States census, the city's population was 69,612, an increase of 5,342 (+8.3%) from the 2010 census count of 64,270, which in turn reflected a decline of 5,554 (−8.0%) from the 69,824 counted in the 2000 census. The city was the state's 17th most populous municipality in 2020, after having been ranked 20th in 2010 and 14th statewide in 2000. The Census Bureau's Population Estimates Program calculated that the city's population was 68,446 in 2022, ranking the city the 553rd-most-populous in the country.

Essex County is located in the northeastern part of the U.S. state of New Jersey, and is one of the centrally located counties in the New York metropolitan area. As of the 2020 census, the county was the state's second-most populous county, with a population of 863,728, its highest decennial count since the 1970 census and an increase of 79,759 (+10.2%) from the 2010 census count of 783,969. The county is part of the North Jersey region of the state.