St. Louis is 18% cheaper than Columbia.
When comparing St. Louis, MO and Columbia, MO, the overall cost of living indices are 66 and 80 respectively (national median = 100). Rent is $89/month cheaper in St. Louis, saving renters about $1,068/year.
Median household income is $9,209/year higher in Columbia. Home values also differ significantly — the median in St. Louis is $185,100 compared to $268,300 in Columbia.
Both cities share the same state tax structure since they are in Missouri.
St. Louis vs Columbia — common questions
Other cost of living comparisons for St. Louis and Columbia