Portland is 30% more expensive than St. Petersburg.
When comparing Portland, OR and St. Petersburg, FL, the overall cost of living indices are 138 and 106 respectively (national median = 100). Rent is $54/month cheaper in St. Petersburg, saving renters about $648/year.
Median household income is $15,674/year higher in Portland. Home values also differ significantly — the median in Portland is $557,600 compared to $331,500 in St. Petersburg.
Florida has no state income tax, giving St. Petersburg residents a significant tax advantage over Oregon's 9.9% rate.
Portland vs St. Petersburg — common questions
Other cost of living comparisons for Portland and St. Petersburg