List of North European Jews
Before the Holocaust, Jews were a significant part of the population in Lithuania where they numbered around 240,000, including approximately 100,000 in Vilnius, or about 45% of that city's pre-World War II population (Vilnius was also once known as the "Jerusalem of Lithuania"). A large Jewish community also existed in Latvia.
Source: Wikipedia — List of North European Jews (CC BY-SA 4.0)