Jersey City is 40% more expensive than St. Petersburg.
When comparing Jersey City, NJ and St. Petersburg, FL, the overall cost of living indices are 148 and 106 respectively (national median = 100). Rent is $360/month cheaper in St. Petersburg, saving renters about $4,320/year.
Median household income is $21,695/year higher in Jersey City. Home values also differ significantly — the median in Jersey City is $534,500 compared to $331,500 in St. Petersburg.
Florida has no state income tax, giving St. Petersburg residents a significant tax advantage over New Jersey's 10.75% rate.
Jersey City vs St. Petersburg — common questions
Other cost of living comparisons for Jersey City and St. Petersburg