U
- (Province of Isabela) Usol
- (Province of Cagayan) Ubong
- (Province of Isabela) Uauang-Galicia
- (Province of Cagayan) Ubong Sur
- (Province of Cagayan) Ugac Norte
- (Province of Isabela) Union
- (Province of Nueva Vizcaya) Unib
- (Province of Nueva Vizcaya) Umoc
- (Province of Isabela) Union
- (Province of Cagayan) Utan
- (Province of Isabela) Udiao
- (Province of Isabela) Union Kalinga
- (Province of Isabela) Uauang-Tuliao
- (Province of Isabela) Ueg
- (Province of Cagayan) Ugac
- (Province of Isabela) Ugad
- (Province of Isabela) Uguep
- (Province of Isabela) Uldugan
- (Province of Nueva Vizcaya) Umubi
- (Province of Cagayan) Unag
- (Province of Isabela) Union
- (Province of Cagayan) Union
- (Province of Batanes) Uvoy
- (Province of Isabela) Ugad
- (Province of Cagayan) Ugac Sur
- (Province of Nueva Vizcaya) Uddiawan