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There's an easier way of doing this. If you use American Factfinder, you can download a list of Census Tracts in each state along with their population and land area. For example, Michigan has 36 Census Tracts with densities above 10,000. The total population of those tracts is 125,926.

There's one in Chippewa County covering the Hiawatha Correctional Facility. Total: 2,222 in 0.14 sq. mi.

There's one in Gratiot County covering the St. Louis Correctional Facility. Total: 2,416 in 0.22 sq. mi.

There are seven in Ingham County covering the Michigan State University area. Total: 20,891 in 0.94 sq. mi.

There's one in Kent County covering a mostly residential bungalow neighborhood. Total: 3,187 in 0.31 sq. mi.

There's one in Oakland County covering a small section of Royal Oak TWP that had been annexed by the city of Oak Park that is primarily post-war suburban-style apartment complexes. Total: 2,100 in 0.14 sq. mi.

There are five in Washtenaw County covering the University of Michigan area. Total: 23,663 in 1.67 sq. mi.

There are twenty in Wayne County covering various areas. Total: 71,447 in 5.94 sq. mi.

What's interesting is that back in 2000 Northeast Detroit had nearly 100,000 people in a contiguous area where the density was over 10,000 ppsm. Today most of those tracts are below 10,000 ppsm. For example, there are 70 more Census Tracts in Wayne County with densities above 7,500 ppsm. The population of those Census Tracts is 231,888. Many of those tracts were above 10,000 ppsm back in 2000.