As of the 2010 United States Census, there were 146,551 people, 51,214 households, and 38,614 families residing in the county. The population density was . There were 54,963 housing units at an average density of . The racial makeup of the county was 50.3% white, 41.0% black or African American, 3.0% Asian, 0.7% American Indian, 0.1% Pacific islander, 1.3% from other races, and 3.7% from two or more races. Those of Hispanic or Latino origin made up 4.3% of the population. In terms of ancestry, 12.6% were Germans, 10.8% were Irish people, 8.7% were English people, 6.3% were Americans, and 5.1% were Italians.

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