Lal-lo, Peñablanca, Tuguegarao 1909–1922 Municipalities: Alcala, Amulung, Aparri, Baggao, Calayan (annexed to Aparri from 1912 to 1920), Camalaniugan, Gattaran, Iguig, Lal-lo, Peñablanca, Tuguegarao, Ballesteros (established 1911), Gonzaga (established 1917) 1922–1972 Municipalities: Alcala, Amulung, Aparri, Baggao, Calayan, Camalaniugan, Gattaran, Gonzaga, Iguig, Lal-lo, Peñablanca, Tuguegarao, Santa Ana (established 1949), Santa Teresita (established 1963) 2nd District Municipalities: Abulug, Allacapan, Ballesteros, Calayan, Claveria, Lasam, Pamplona, Piat, Rizal, Sanchez-Mira, Santa Praxedes, Santo Niño Population (2020): 322,634 Notes 1907–1922 Municipalities: Abulug, Claveria, Enrile, Faire, Mauanan, Pamplona, Piat, Sanchez-Mira, Solana, Tuao 1922–1935 Municipalities: Abulug, Ballesteros, Claveria, Enrile, Santo Niño (Faire), Rizal (Mauanan), Pamplona, Piat, Sanchez-Mira, Solana, Tuao 1935–1972 Municipalities: Abulug, Ballesteros, Claveria, Enrile, Santo Niño (Faire), Rizal (Mauanan), Pamplona, Piat, Sanchez-Mira, Solana, Tuao, Santa Praxedes (Langangan) (annexed from Mountain Province 1922; only voted starting 1935), Allacapan (annexed from Mountain Province 1928; only voted starting 1935), Lasam (established 1950) 3rd District City: Tuguegarao (became city 1999) Municipalities: Amulung, Enrile, Iguig, Peñablanca, Solana, Tuao Population (2020): 486,150 Notes At-Large (defunct) 1943–1944 includes the sub-province of Batanes 1984–1986 See also Legislative district of Batanes Legislative district of Mountain Province References Cagayan Politics of Cagayan