The Isilkul station, whose name translates from Kyrgyz as "Captain's Lake," is located on the Siberian railway in the Omsk district, 128 versts from the diocesan city and 70 versts from the deanery. Here stands a single-altar church dedicated to the Moscow saints Peter, Alexis, Jonah, and Philip. It was built in 1897 with funds from the Alexander III Foundation and consecrated on January 18, 1898. The main part of the funds for the church's maintenance was provided by Moscow merchant of the first guild I.D. Baev and his wife. The church building is wooden, with a bell tower, covered with iron, sturdy and spacious, with a sufficient amount of utensils.

Sacred vessels such as the chalice, diskos, and tabernacle were gifted by Emperor Nicholas II. They were made from wreaths presented in memory of Emperors Alexander II and Alexander III.

The parish has five cemeteries: one at the station and one in each village. The church has no capital or income-generating lands, and there are no locally venerated icons. A chapel is located in the cemetery of the Roslavsky settlement.

The parish has 940 men and 903 women of the Orthodox faith. It includes the villages of Gorodishchenskaya, Pavlovka, Roslavka, and Blagoveshchenka, with no difficulties in communication. The residents of these villages migrated from the Penza and Smolensk provinces, as well as a few from the Oryol and Poltava regions. On average, there are 260 baptisms, 25 marriages, and 150 burials per year.

The church-parish school named after Father John of Kronstadt opened on February 18, 1898, and educates 56 boys and 36 girls, funded by the railway. In the village of Gorodishchenskaya, there is a ministerial school, and in 1911, a city school was opened at the station. There is a choir at the church, consisting of students from the church-parish school and station employees, managed by a hired choirmaster. The church-school land is allocated 120 desyatins.

There are no special houses for the clergy, and they reside in the railway house, with firewood provided by the railway. The priest receives a salary of 780 rubles per year, while the psalmist receives 420 rubles. Brotherhood income amounts to about 600 rubles per year, the clergy has no capital, and no in-kind collections are made. The church and the premises for the clergy are maintained with funds from the railway.

Easter visits with icons are conducted in all houses of the villages Gorodishchenskaya and Roslavka, and in Pavlovka and Blagoveshchenka, only by invitation. Processions after the sowing of grains take place in all settlements, with 2-3 molebens served in the fields. The clergy consists of a priest and a psalmist.

The Church of the Four Moscow Saints Peter, Alexis, Jonah, and Philip was the first church at the Isilkul station. The entirely wooden building made of pine was erected on a foundation of wild stone. The single-story church, designed for 450 people, was built with funds from the Alexander III Foundation and cost 13,000 rubles. The consecration took place on January 18, 1898. After the revolution, the church burned down.