Until 2022 the number of mandates allocated in proportional and majoritarian parts were standing at 14 each.

[1] Seats in the proportional part are allocated using the Imperiali quota, modified to ensure that every party list, which passes the threshold, receives at least one mandate ("Tyumen method").

The following parties were relieved from the necessity to collect signatures:[3] New People and RPPSS will take part in Sakhalin Oblast legislative election for the first time, while For Women of Russia and Patriots of Russia, who participated in the 2017 election, had been dissolved henceforth.

18 single-mandate constituencies were formed in Sakhalin Oblast, an increase of 4 seats since last redistricting in 2017.

Former Sakhalin Oblast Duma Speaker Andrey Khapochkin (United Russia) was appointed to the Federation Council, replacing incumbent Yury Arkharov (Independent).