K
- (Romenskyi Raion) Koreneve
- (Romenskyi Raion) Kynashove
- (Sumskyi Raion) Kolomyitsi
- (Romenskyi Raion) Khomenkove
- (Romenskyi Raion) Kolomiitseva Dolyna
- (Romenskyi Raion) Kolisnyky
- (Okhtyrskiy Rayon) Konovalyk
- (Sumskyi Raion) Kharchenky
- (Sumskyi Raion) Kharkivshchyna
- (Okhtyrskiy Rayon) Korabelske
- (Okhtyrskiy Rayon) Koziatyn
- (Sumskyi Raion) Kamiane
- (Okhtyrskiy Rayon) Kopiiky
- (Okhtyrskiy Rayon) Kyrykivka
- Kirikovka
- (Sumskyi Raion) Krasnopillia
- (Konotops’ka Mis’krada) Krolevets
- Konotop