U
- (Province of Ilocos Sur) Ubanan
- (Province of Ilocos Sur) Uyalas
- (Province of Ilocos Norte) Uguis
- (Province of La Union) Udeo
- (Province of Ilocos Norte) Ubug
- (Province of Ilocos Sur) Ubbog
- (Province of Ilocos Sur) Ubbog
- (Province of La Union) Ubbog
- (Province of La Union) Ubbog
- (Province of Ilocos Sur) Uso
- (Province of Pangasinan) Uban
- (Province of La Union) Ubagan
- (Province of Ilocos Norte) Upas
- (Province of Ilocos Norte) Ulab
- (Province of Pangasinan) Uhgib
- (Province of Pangasinan) Umanday East
- (Province of Pangasinan) Umanday Oeste
- (Province of Ilocos Sur) Urdas
- (Province of Ilocos Sur) Ul-oling
- (Province of La Union) Uyaoy
- (Province of Ilocos Sur) Urzadan
- (Province of La Union) Ursuban
- (Province of La Union) Urbistondo
- (Province of La Union) Urayong
- (Province of La Union) Urayong
- (Province of Ilocos Norte) Upuplig
- (Province of La Union) Up-uplas
- (Province of Ilocos Norte) Upon
- (Province of Pangasinan) Unkat
- (Province of Ilocos Sur) Union