Tucson is 15% more expensive than St. Louis.
When comparing Tucson, AZ and St. Louis, MO, the overall cost of living indices are 76 and 66 respectively (national median = 100). Rent is $101/month cheaper in St. Louis, saving renters about $1,212/year.
Median household income is $733/year higher in St. Louis. Home values also differ significantly — the median in Tucson is $242,200 compared to $185,100 in St. Louis.
Arizona has a lower income tax rate, making Tucson slightly more tax-friendly.
Tucson vs St. Louis — common questions
Other cost of living comparisons for Tucson and St. Louis