| 475 |
Called 'Suliholhyun' for the first time by King 'Jangsu' of Koguryo in his 63rd reign. |
| 757 |
Changed into 'Bongseonghyun' during the 16th reign of King 'Kyungdeok' of Silla. |
| 1174 |
Changed into 'Seowonhyun' during the 4th reign of King 'Myeongjong' of Koryo Dynasty. |
| 1393 |
Elevated to 'Seowon-gun' during the 2nd reign of King 'Taejo' of Joseon Dynasty. |
| 1398 |
Changed into 'Wonpyung-gun' affiliated with 'Papyunghyun' during the 7th reign of King'Taejo' of Joseon Dynasty. |
| 1414 |
Merged 'Gyohahyun' with 'Wonpyung-gun' during the 14th reign of King 'Taejo' of Joseon Dynasty. |
| 1415 |
Elevated 'Wonpyung-gun' to 'Dohobu' during the 15th reign of King 'Taejong' of Joseon Dynasty. |
| 1418 |
Downgrade to 'Wonpyung-gun' separated from 'Gyohahyun' during the 18th reign of King 'Taejong' of Joseon Dynasty, then re-elevated to 'Dohobu' by an appeal of residents. |
| 1459 |
Reorganized to 'Pajumok' during the 5th reign of King 'Sejo' of Joseon Dynasty. |
| 1895 |
Changed 'Pajumok' to 'Paju-gun' during the 32nd reign of King 'Gojong' of Joseon Dynasty. |
| Mar. 1, 1914 |
Incorporated 'Gyoha-gun' with 'Paju-gun' (10 Myeons) |
| Nov. 3, 1945 |
Incorporated Jeok Seong-Myeon, Nam-Myeon, Yeoncheon-gun (12 Myeons) |
| Feb. 5, 1946 |
Transferred Nam-Myeon to Yangju-gun (11 Myeons) |
| Dec. 28, 1972 |
Incorporated Jangdan-Myeon of Jangdan-gun, Gunnae-Myeon, Jindong-Myeon, and Jinseo-Myeon (15 Myeons) |
| Jul. 1, 1973 |
Elevated Adong-Myeon to Geumchon-eup, Imjin-Myeon to Munsan-eup(2 Eups and 13 Myeons) |
| May 1, 1979 |
Opened a branch office in Gunnae-Myeon |
| Dec. 1, 1980 |
Elevated Junae-Myeon to Paju-eup (3 Eups and 12 Myeons) |
| Feb. 15, 1983 |
Incorporated Kisan-ri and Yeonjang-ri, Baekseok-Myeon, Yangju-gun with Gwangtan-Myeon ,then opened Yeongjang branch office |
| Jan. 1, 1987 |
Incorporated the part of (Kisan 1-ri) of Kisan-ri, Gwangtan-Myeon with Baekseok-Myeon,Yangju-gun |
| Apr. 1, 1989 |
Elevated Chunhyun-Myeon to Bubwon-eup (4 Eups and 11 Myeons) |
| Mar. 1, 1996 |
Elevated to Paju city from Paju-gun |
| Mar. 1, 1996 |
Branched Geumchon-eup into Geumchon 1-dong and Geumchon 2-dong (3 Eups, 11 Myeons, and 2 Dongs) |
| Mar. 1, 2002 |
Elevated Gyoha-myeon to Goyha-eup, and Jori-myeon to Jori-eup (5 Eups, 9 Myeons, 2 Dongs) |