- Ubaranai
- Urashibetsu
- Urayakotan
- Uenbetsu
- Uesaka
- Ueno
- Usuchō
- Uennai
- Umegaechō
- Utanobori-chūō
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- Utanobori-higashiutanobori
- Utanobori-honhorobetsu
- Utanobori-hōyoku
- Utanobori-kamitokushibetsu
- Utanobori-ketobetsu
- Utanobori-minamimachi
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- Utanobori-nishiutanobori
- Utanobori-ofun
- Utanobori-ōmagari
- Utanobori-pankenai
- Utanobori-penkenai
- Utanobori-shibiutan
- Utsunai
- Uchigō
- Utabetsu
- Utaroppu
- Urausunai