| Three Han States Period |
- Imsil belonged to the Mahan State, as New Wunsin State (臣雲國).(『History of Imsilgun』, 1977).
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| Three States Period |
- Imsil was Inghil-gun (仍肹郡)’ in Baekje (including Geosamul-hyeon and Madol-hyeon according to 『Geography of Korea』). (『Geography Vol. 3, Historical Record of the Three Kingdoms (三國史記 地理3)』)
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| Unified Silla Period |
- Imsil-gun belonged to Namwon-bu (南原府).
- Inghil-gun was renamed Imsil-gun in 759 (the 16th year of King Gyeongdeok’s reign). Geosamul-hyeon and Madol-hyeon were renamed Cheongwung-hyeon and Maryeong-hyeon, respectively.
- Sang-eam (上耳庵) Temple was built in 875 (the first year of King Heongang’s reign).
- King Taejo Wang Geon (17 years old) prayed in Sang-eam and left ‘Hwanhuidam’ in 894.
- Jingusa Temple was built in around the 7th century.
- Imsil Jingusa Temple Site Stone Pagoda was bulit from the 8th to 9th century. (珍丘寺址石燈, Treasure No. 267)
- Imsil Yongsam-ri Temple Site Stone Vairocana Buddha was made from the 8th to 9th century. (Provincial Intangible Cultural Heritage No. 82)
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| Goryeo Period |
- Imsil-gun was established in Jeonju-mok, Jeolla-do in 983.
- The Tale on the Dog of the Osu Spread was made in 1250. (『Collection to Relieve Idleness』 by Choi Ja).
- King Taejo Yi Seonggye of Joseon prayed in Sang-eam Temple in 1380 and left Samcheongdong Monument. (Imsil-gun Local Cultural Heritage Monument No. 2)
- Hakjeong-ri Stone Buddha was made in the late Goryeo period. (Provincial Tangible Cultural Heritage No. 87)
- Osu-ri Stone Buddha was made in late the Goryeo period. (Provincial Tangible Cultural Heritage No. 86)
- Okjeongam Temple Site, Seated Stone Buddha carved in a cliff was made in the late Goryeo period. (Imsil-gun Local Cultural Heritage Monument No. 5)
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| Joseon Period |
- Imsil-gun (任實郡) was renamed to Imsil-hyeon (任實縣) in 1413 (the 13th year of King Taejong’s reign).
- Several Confucian cultural relics were built including Imsil Confucian schools (任實鄕校) and private Confucian academies.
- Imsil-hyeon was reorganized as Imsil-gun in 1895.- Development of the West District Farmers’ Music of the Southwestern Region due to the agriculture-focused industry.
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| 1906
(Great Korean Empire) |
- 24 myeons, 359 ris
- WIth the geographical arrangement and reorganization of administrative districts in 1906, 6 bangs from Namwon-bu were incorporated into Imsil-gun.
(Dundeok-bang, Malcheon-bang, Oji-bang, Seokhyeon-bang, Asan-bang and Yeonggye-bang which were included in Namwon-gun)
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| Apr. 1, 1914
(Japanese Colonial Era) |
- 12 myeons, 130 ris
- Sangdong-myeong and Hadong-myeon were integrated into Seongsu-myeon, Nam-myeon and Dunnam-myeon were integrated into Dundeok-myeon, Sindeok-myeon and a part of Wonsin-myeon were integrated into Sindeok-myeon, Oji-myeon, Seokhyeon-myeon and Asan-myeon were integrated into Samgye-myeon, and Sangbuk-myeon and Habuk-myeon were integrated into Ocheon-myeon.
- Yeonggye-myeon in Imsil-gun was incorporated into Sunchang-gun.
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| 1920 |
- Imsil-gun government office was built (on the former government building site).
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| Mar. 1, 1935 |
- Ocheon-myeon was renamed to Gwanchon-myeon.
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| Jul. 5, 1965 |
- 12 myeons, 1 branch office, 130 ris. Hawunam Branch Office was established in Wunam-myeon in accordance with Provincial Ordinance No. 91 (promulgated on Jul. 5, 1965)
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| 1967 |
- Imsil-gun Government Office was moved (390, Ido-ri)
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| May 1, 1979 |
- 1 eup, 11 myeons, 1 branch office, 130 ris. Imsil-myeon was promoted to Imsil-eup in accordance with Presidential Decree No. 9409 (promulgated on Apr. 7, 1979)
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| Feb.15, 1983 |
- 1 eup, 11 myeons, 1 branch office, 131 ris. Geumam-ri, Deokgwa-myeon, Namwon-gun were incorporated into Dunnam-myeon in accordance with Presidential Decree No. 11027 (promulgated on Jul. 10, 1983)
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| Jan. 1, 1987 |
- 1 eup, 11 myeons, 1 branch office, 131 ris. Jongseong 3-ri, Sannae-myeon, Jeongeup-gun was incorporated into Yongsu-ri, Gangjin-myeon, Imsil-gun in accordance with Presidential Decree No. 12007 (promulgated on Dec. 23, 1986).
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| Apr. 1, 1990 |
- Geumseong-ri, Gwanchon-myeon was incorporated into Imsil-eup in accordance with the reorganization of administrative districts.
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| Aug. 10, 1992 |
- Dunnam-myeon was renamed to Osu-myeon.
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| Dec. 12, 1994 |
- Sinjeong-ri and Manjeong-ri, Samgye-myeon were incorporated into Imsil-eup in accordance with the reorganization of administrative districts.
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| 2010 |
- Imsil-gun Government Office moved into the new government building (30, Sujeong-ro).
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