Essex County is a county in the northeastern part of the U.S. state of New Jersey. As of the 2017 Census estimate, the county's population was 808,285, making it the state's third-most populous county, an increase of 3.1% from the 2010 United States Census, when its population was enumerated at 783,969, in turn a decrease of 1.2% (9,664 fewer residents) from the 793,633 enumerated in the 2000 Census. In 2010, the county dropped down to third-largest, behind Middlesex County, and was one of only two counties in the state to see a decline between 2000 and 2010 (Cape May County being the other). Its county seat is Newark, the most populous city in the state. It is part of the New York Metropolitan Area.
According to the United States Census Bureau, the county had an area of 129.631 square miles (335.74 km²), including 126.212 square miles (326.89 km²) of land (97.4%) and 3.419 square miles (8.86 km²) of water (2.6%). The county rises from generally flat in the east to the twin ridges of the Watchung Mountains in the western half, beyond which the land lowers again into the Passaic River valley.
As of the 2010 United States Census, there were 783,969 people, 283,712 households, and 189,236 families residing in the county. The population density was 6,211.5 per square mile (2,398.3/km²). There were 312,954 housing units at an average density of 2,479.6 per square mile (957.4/km²). The racial makeup of the county was 42.59% (333,868) White, 40.88% (320,479) Black or African American, 0.39% (3,056) Native American, 4.57% (35,789) Asian, 0.04% (286) Pacific Islander, 8.38% (65,687) from other races, and 3.16% (24,804) from two or more races. Hispanic or Latino of any race were 20.30% (159,117) of the population.
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