What county has the largest black population?

Cook County, Illinois, has the largest Black population among the options provided. This is largely due to Chicago being a significant urban center with a long history of Black migration from the rural South during the Great Migration, which has established a strong and vibrant Black community over decades. Factors such as economic opportunities, educational institutions, and social networks have contributed to this concentration.

In contrast, while the other counties mentioned have sizable Black populations, they do not surpass the predominance found in Cook County. Each of those locations features diverse populations and different historical factors influencing their demographic trends, but none have the same level of Black population density as Cook County. Understanding these demographic patterns is essential in addressing issues of cultural diversity and disparities in healthcare, education, and employment within these communities.