Upsala is a city in Morrison County, Minnesota, United States. The population was 487 at the 2020 census, up from 427 in 2010. A post …Upsala is a city in Morrison County, Minnesota, United States. The population was 487 at the 2020 census, up from 427 in 2010. A post office called Upsala was established in 1883. Swedish settlers named the city after Uppsala, Sweden.