High-risk lead ZIP codes in the six-county Chicago metropolitan area mostly include suburbs that have significant Latino and black populations and low median household incomes. This trend holds true for Chicago; though the whole city is considered high-risk, its most-affected areas are black and Latino neighborhoods on the West and South sides.

Note: The state of Illinois designates high-risk ZIP codes by looking at the age of the housing, the number of poor families and the prevalence of children previously found to have elevated blood lead levels.
Sources: The Illinois Department of Public Health; U.S. Census Bureau.