Auckland was the 347th most unaffordable out of 360 worldwide. Tauranga was rated 331st most unaffordable.
Overall, housing in New Zealand was "severely unaffordable", with a median multiple of 5.5.
Tauranga Mayor Stuart Crosby said the survey was not surprising but he added: "This is but one indicator, one measurement and cannot be viewed as the full story.
"It is a double-edged sword. On one side, if you have a house an increase in value is a good thing, it means more equity. But if you are trying to get on to or stay on the property ladder while dealing with a low income, it can be very challenging."
Mr Crosby said the council was trying to increase wages locally by driving a strong economy through infrastructure.
"By doing that, we will attract the right kind of business to our city," he said. "Our philosophy on affordable housing is that ratepayers' input should be low. Ratepayers should not subsidise people on to the property market but we do what we can to keep costs down, by keeping developer contribution to a minimum."
Demographia sourced its New Zealand housing data from the Real Estate Institute and the incomes from Statistics NZ.