Detroit is 20% cheaper than St. Louis.
When comparing Detroit, MI and St. Louis, MO, the overall cost of living indices are 53 and 66 respectively (national median = 100). Rent is $56/month cheaper in St. Louis, saving renters about $672/year.
Median household income is $15,704/year higher in St. Louis. Home values also differ significantly — the median in Detroit is $76,800 compared to $185,100 in St. Louis.
Michigan has a lower income tax rate, making Detroit slightly more tax-friendly.
Detroit vs St. Louis — common questions
Other cost of living comparisons for Detroit and St. Louis