Northern Krai
On July 15, 1929, the uyezds were abolished, the governorates were merged into Northern Krai, and Ust-Kubinsky District was established among others. It became a part of Vologda Okrug of Northern Krai. In the following years, the first-level administrative division of Russia kept changing. In 1936, the krai was transformed into Northern Oblast. In 1937, Northern Oblast itself was split into Arkhangelsk Oblast and Vologda Oblast. Ust-Kubinsky District remained in Vologda Oblast ever since.