Atlanta is 15% more expensive than St. Petersburg.
When comparing Atlanta, GA and St. Petersburg, FL, the overall cost of living indices are 122 and 106 respectively (national median = 100). Rent is $75/month cheaper in St. Petersburg, saving renters about $900/year.
Median household income is $8,820/year higher in Atlanta. Home values also differ significantly — the median in Atlanta is $420,600 compared to $331,500 in St. Petersburg.
Florida has no state income tax, giving St. Petersburg residents a significant tax advantage over Georgia's 5.49% rate.
Atlanta vs St. Petersburg — common questions
Other cost of living comparisons for Atlanta and St. Petersburg