lithuanian Jewry

 There were never more than 250,000 Jews in Lithuania. In 1800, it was 10% of Jewry. In 1900, 2.5%. 

http://www.truelithuania.com/tag/historical-maps-of-lithuania

At one point Lithuania covered Belarus too. 

Vilna Gaon
Sialiec, April 23, 1720 – Vilnius October 9, 1797

Sialiec (Belarusian: Сялец, Russian: Селец, Polish: Sielec) is an agrotown in the Biaroza rayon of the Brest Voblast of Belarus.

Lith. 1800