There's a few things about this data that indicate why this is not useful: 1. The New York City Sq Mileage number includes water. 2. Density for each of these

There's a few things about this data that indicate why this is not useful: 1. The New York City Sq Mileage number includes water. 2. Density for each of these cities varies widely by community. For example, 6% of Chicago's sq mileage is in the O'Hare community, which has a population density of 1000 residents per square mile. A better comparison would be Chicago vs. the Bay Area You'd probably have to compare areas of similar population density to make a serious statement.