Detroit's 1990 population density map:
source:
https://detroitography.com/2020/06/1...-density-1990/
Almost no tracts west of Woodward and north of I-94 were below 4-7.9k density. Almost all of the depopulated tracts were in southwest Detroit or the east side of Detroit. The city's 2020 population density is about 4,600 ppsm, versus the 1990 density of 7,400 ppsm.