Orlando is 8% more expensive than St. Petersburg.
When comparing Orlando, FL and St. Petersburg, FL, the overall cost of living indices are 115 and 106 respectively (national median = 100). Rent is $108/month cheaper in St. Petersburg, saving renters about $1,296/year.
Median household income is $3,850/year higher in St. Petersburg. Home values also differ significantly — the median in Orlando is $359,000 compared to $331,500 in St. Petersburg.
Both cities share the same state tax structure since they are in Florida.
Orlando vs St. Petersburg — common questions
Other cost of living comparisons for Orlando and St. Petersburg