- Silla Dynasty : Toehwa-hyeon, Jidap-hyeon, Geunoji-hyeon, Haeah-hyeon
- Goryeo Dynasty: Re-titled to Heunghae-gun, Janggi-hyeon, Yeongil-hyeon, Cheongha-hyeon
- 1896.08.04 : Four counties, Heunghae, Cheongha, Yeonil, and Janggi were established due to the practice of 13-Do system
- 1914.03.01 : Four counties unified as Yeongil-gun (18 myeons)
- 1931.04.01 : Pohang-myeon promoted to Pohang-eup (1 eup, 17 myeons)
- 1934.04.01 : Jukbuk.Juknam-myeon unified as Jukjang-myeon, Janggi. Bongsan-myeon unified as Jihaeng-myeon (1 eup, 15 myeons)
- 1938.10.01 : Hyeongsan-myeon incorporated into Pohang-eup (1 eup, 14 myeons)
- 1942.10.01 : Changju-myeon promoted to Guryongpo-eup (2 eups, 13 myeons)
- 1949.08.15 : Pohang-eup promoted to Pohang-si (1 si, 1 eup, 13 myeons, 1 branch office)
- 1956.07.08 : Heunghae, Gokgang-myeon incorporated into Uichang-myeon (1 si, 1 eup, 12 myeons)
- 1957.10.29 : Abolition of Daljeon-myeon, incorporated into Heunghae/Yeonil (1 si, 1 eup, 11 myeons)
- 1967.03.01 : Establishment of Gibuk branch office of Gigye-myeon
- 1973.07.01 : Uichang-myeon promoted to Uichang-eup (1 si, 2 eups, 10 myeons, 3 branch offices)
- 1980.12.01 : Yeonil, Ocheon-myeon promoted to eups (1 si, 4 eups, 8 myeons, 3 branch offices)
- 1982.09.01 : Separation of Haedo 1/2 dong, Sangdae 1/2 dong
- 1986.04.01 : Daebo, Gibuk branch office promoted to myeon (1 si, 4 eups, 10 myeons, 1 branch office)
- 1995.01.01 : Starts as united Pohang-si (1 si, 2 gus, 4 eups, 10 myeons, 25 dongs, 1 branch office)
- 1998.09.01 : Unification of Gwaso-dong (1 si, 2 gus, 4 eups, 10 myeons, 19 dongs, 1 branch office)
- 2006.12.26 : Moved into the new building in Daejam-dong
