K
- (Okhtyrskiy Rayon) Kramchanka
- (Romenskyi Raion) Kozelne
- (Shostkyns’ka Mis’krada) Koven’ki
- (Sumskyi Raion) Kotenky
- (Sumskyi Raion) Kostiv
- (Sumskyi Raion) Kosivshchyna
- (Konotops’ka Mis’krada) Koshary
- (Sumskyi Raion) Korshachyna
- (Romenskyi Raion) Korovyntsi
- (Sumskyi Raion) Korchakivka
- (Sumskyi Raion) Kostiantynivka
- (Sumskyi Raion) Kindrativka
- (Shostkyns’ka Mis’krada) Komarivka
- (Okhtyrskiy Rayon) Komarivka
- (Sumskyi Raion) Komarytske
- (Konotops’ka Mis’krada) Kocherhy
- (Shostkyns’ka Mis’krada) Kniazhychi
- (Okhtyrskiy Rayon) Knyazha
- (Konotops’ka Mis’krada) Knyazevo
- (Shostkyns’ka Mis’krada) Klyuchkin
- (Sumskyi Raion) Kliuchynivka
- (Shostkyns’ka Mis’krada) Klochkivka
- (Shostkyns’ka Mis’krada) Klyshky
- (Sumskyi Raion) Klimovka
- (Konotops’ka Mis’krada) Klepaly
- (Sumskyi Raion) Kyianytsia
- (Sumskyi Raion) Kislovka
- (Sumskyi Raion) Kysla Dubyna
- (Romenskyi Raion) Kymlychka
- (Konotops’ka Mis’krada) Khvostovtsy