Северная область
In the following years, the first-level administrative division of Russia kept changing. In 1929, Northern Dvina Governorate was merged into Northern Krai, which in 1936 was transformed into Northern Oblast. In 1937, Northern Oblast was split into Arkhangelsk Oblast and Vologda Oblast. Krasnoborsky District remained in Arkhangelsk Oblast ever since. Some areas of the district were eventually transferred to Kirov Oblast, Lensky, and Kotlassky Districts.