Petropavlovsk oil production supplied oil to St. Petersburg, Moscow, Riga, revel, Odessa, Samara, Vladivostok, as well as to England, Germany and Denmark. The largest were the Zenkov brothers ' tannery, and the factory for processing the intestines of the Swiss Accola. According to the census of 1897, there were 20014 people living in Petropavlovsksource is not specified 3714 days. Accounted for the bulk of Russians, Kazakhs, there were about 1500 people. A significant group were the Tatars-immigrants. According to the source "Cities of Russia in 1910" St. Petersburg, 1914 in 1910, 37,973 people lived in Petropavlovsk, including by national composition: Russians — 72.8%, Turkish-Tatars — 25.2%, poles — 0.5%, Jews-1.1%, Germans-0.2%, Finns-0.2 %.