The agreement on Swedish Pomerania between Sweden and Prussia from 1815 contains an article that is central for this essay. It states that the inhabitants of Swedish Pomerania and the Pomeranian in Sweden were given six years to decide in which of the kingdoms they wanted to be citizens after Sweden had left Pomerania. Since this possibility was raised in an international treaty, one can assume that both signatories supposed it was a matter that would affect a certain number of individuals within Swedish Pomerania. I am examining to which extent this possibility was used, by whom and why. All in all, I have been able to show that there was a clear perception among the authorities of both sides that a certain number of inhabitants probably would want to leave Pomerania in connection with the transition to Prussia. I have also shown that people actually moved from Pomerania to Sweden during the years 1815 to 1821, although this was never the question of a major wave of emigration. Those who moved proved to have different motives and that these motives varied depending on background, occupation etc. The same applies to those who stayed.