Almost anywhere in Europe and the US. If people are out at night drinking and there aren't easily accessible public toilets, then there really isn't much of an option for non-public urination.
It's not when you go to Germany and the public toilets you find cost money to use.
Mind you, at least you get clean,working toilets for your money, I was rather disgruntled in Brussels when I paid a euro to use the toilet and there was urine all over the floors and half the urinals were out of order.
This is surprising. I thought it is only a third world problem and Germany is very clean.
What are other developed countries where public urination is common?