Oakland had less than 1,800 COVID-19 cases by March 31 , 2020 .
Theories vary on why Detroit is a COVID-19 'hot spot ' Crain 's Detroit Business , March 31 , 2020 Oakland , Macomb , and Wayne counties all have over 1,500 cases each , the latter of which accounts for nearly half the total number of cases and deaths in the state .
2020 coronavirus pandemic in Michigan