The oldest name of Incheon was Michuhol, during the time of settlement of prince Biryu. During the era of Samhan (Three Kingdom) and Samguk, it was called Gyeongwon-bu, and Goryeo dynasty named this area Inju. This name was switched to Incheon-gun during the 13th year of King Taejong's reign in Joseon Dynasty, and the downtown was located Gwangyo-dong, which is currently located in Michuhol-gu. Incheon-gun was promoted to Incheon-dohobu during the 6th year of King Sejo’s reign in Joseon Dynasty because it was the hometown of Queen Soheon (wife of King Sejong), mother of King Sejo. However, Incheon-dohobu was degraded to Incheon-hyun during the 24th year of King Sukjong’s reign, but it was promoted to Incheon-dohobu again in 1698. Sungui-dong became Daehwajeong in 1936. Some parts of Sachungri and Ganseok-ri Daju-myeon Bucheon-gun were incorporated into Juan-dong, which was renamed Juanjeong in 1936, the same time period when Incheonbu was expanded. With the advent of the so -called “West Sea Era,” Michuhol-gu has been developing as a vibrant center of Incheon after dozens of expansions and transformations.
| 1936.10.1 | Sungui-dong area was separated from Daju-myeon,Bucheon-gun, and was annexed into Daehwa-jeong, Incheon-bu |
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| 1936 | Juan-dong annexed Sachung-ri and part of Ganseok-ri of Daju-myeon, Buchon-gun, and was named Juan-jeong, Incheon-bu. |
| 1940 | Integrated to Namdong-myeon when the surrounding region was named Incheonbu |
| 1943.7.10 | Munhak Branch Office is established to govern five dongs including Munhak-dong. |
| 1947.4.1 | The Incheonbu local district office's Juan branch was established, which controlled 9 dongs including Dohwa 1 dong. (United States Army Military Government in Korea) |
| 1948.8.15 | Three local district offices were officially launched in Namdong, Munhak, and Juan respectively. |
| 1949.8.15 | Incheon Bu was renamed into Incheon city according to the legislation of Local Autonomy-System. |
| 1955.8.1 | Munhak and Juan Branch Offices were closed according to Incheon City Ordinance No.128. |
| 1956.10.1 | Munhak and Juan Branch Offices were reopened according to Incheon City Ordinance No. 143. |
| 1956.11.23 | Branch Offices were divided into Nambu, Namdong, Munhak, and Juan Branch Offices-according to Incheon City No. 144. |
| 1967.3.30 | Gu-Establishment-Law for Incheon was pronounced according to Law No. 1919. |
| 1968.1.1 | Eliminated several local district offices. (The local district offices of Munhak,-Nambu, Juan and Nam-dong were consolidated.) |
| 1970.1.1 | Michuhol-gu established twenty-eight dongs by making 4 new dongs according to Incheon City Ordinance No.628 |
| 1979.1.1 | Michuhol-gu established twenty-nine dongs by making 1 new dong according to Incheon City Ordinance No.1146 |
| 1979.5.1 | Michuhol-gu established thirty-two dongs by making 3 new dongs according to Incheon City-Ordinance No.1187. |
| 1981.7.1 | Incheon City were upgraded into Incheon Jikhal City, which was under the direct control of the central government |
| 1982.9.1 | Michuhol-gu established thirty-seven dongs making 5 new dongs according to Incheon Jikhal City Ordinance No.1596. |
| 1983.10.1 | Michuhol-gu established thirty-eight dongs by making 1 new dong according to incheon Jikhal City Ordinance No.1649. |
| 1985.11.15 | Michuhol-gu established forty dongs by making 2 new dongs according to Incheon Jikhal City Ordinance No.1895. |
| 1988.1.1 | Namdong-gu was newly divided 13 dongs from Michuhol-gu, and Michuhol-gu had twenty -seven dongs according to Presidential Decree Chapter No.12367. |
| 1991.11.4 | Michuhol-gu Office was relocated to 131-1 Sungui-dong according to Ordinance No. 228. |
| 1994.7.1 | Michuhol-gu established twenty -nine dongs by making 2 new dongs according to Ordinance No. 321. |
| 1995.1.1 | Incheon Jikhal City became Metropolitan City of Incheon. |
| 1995.3.1 | Yeonsu-gu was newly divided from 8dongs Michuhol-gu,and Michuhol-gu had twenty three dongs according to Law No. 4802 |
| 1996.3.1 | Michuhol-gu established twenty -four dongs by making 1 new dong according to Ordinance No. 379. |
| 2009.2.1 |
Combine 3 dongs and make 21 dongs (Ordinance No. 947) Sungui 1(il)-dong and Sungui 3(sam)-dong to merge into Sungui 1(il)·3(sam)-dong Yonghyeon 1(il)-dong and Yonghyeon 4(sa)-dong to merge into Yonghyeon 1(il)·4(sa)-dong Dohwa 2(i)-dong and Dohwa 3(sam)-dong to merge into Dohwa 2(i)·3(sam)-dong |
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