Towns and villages
Prior to its dissolution, the district consisted of only one village:
- Classified as a village.
- On 1954 - The areas now covering Ojiya were merged and elevated to city status.
- On November 1, 2004 - The towns of Horinouchi and Koide, and the villages of Hirokami, Irihirose, Sumon and Yunotani were merged to form the city of Uonuma.
- On March 31, 2010 - The town of Kawaguchi was merged into the expanded city of Nagaoka. Therefore, Kitauonuma District was dissolved as the result of this merger.