In the 94597 ZIP code in Contra Costa County (Walnut Creek), life expectancy was 87.4 years. In the 94603 ZIP code in nearby Alameda County (Oakland neighborhood Sobrante Park), it plummeted to 71.2 years. Iton’s team had uncovered a 16-year gap in life expectancy in two areas that were 22 miles apart. The same pattern was unearthed in other cities where the data was compiled: Baltimore, Minneapolis, Los Angeles, and others. In Cleveland, a 4-mile walk from the Shaker Heights neighborhood to the Baldwin Water Treatment Plant took about 80 minutes, and over the span of that walk, 23 years of
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