Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Mologsky Uyezd (Мологский уезд) was one of the subdivisions of the Yaroslavl Governorate of the Russian Empire. It was situated in the northwestern part of the governorate. Its administrative centre was Mologa.
Demographics
At the time of the Russian Empire Census of 1897, Mologsky Uyezd had a population of 117,696. Of these, 99.9% spoke Russian as their native language.