Considering the fact that Old Stone Age relics have been found in Seokjang-ri, Gongju, it can be said that Chungnam’s history starts with the Paleolithic age.
Samhan age
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About 15 states were included in the territory of Chungnam including Mokjiguk (Jiksan, Cheonan) among the 54 states of Mahan
Three Kingdoms Era
475 AD (the 2nd year of King Munju)
The capital was moved from Hanseong (now called Seoul) to Ungjin (now called Gongju).
538AD (the 16th year of King Seong)
The capital was moved from Ungjin (now called Gongju) to Sabi (now called Buyeo).
660 AD (the 20th year of King Euija)
The kingdom of Baekje was conquered by the Silla-Dang forces. Ungjin Dodok-bu was organized.
671 AD (the 11th year of King Munmu)
Reorganized into Soburi-ju (Sabi)
686 AD (the 6th year of King Sinmun)
Renamed to Ungcheon-ju
757 AD (the 16th year of King Gyeongdeok)
Included in the territory of Post Baekje
Goryeo Dynasty
-
938 AD (the 2nd year of King Seongjong)
12 Mokje (12 administrative districts) organized and Gongjumok established
995 AD (the 14th year of King Seongjong)
Reorganized into 10 provinces
Hanam-do which includes Ungju (Gongju), Unju (Hongseong), and others were organized
1106 Yanggwang-Chungcheongju-do which unites three provinces (Gwannae-do, Chungwon-do, and Hanam-do) was organized
1171 Yanggwangju-do and Chungcheongju-do split off
Reorganized into Soburi-ju (Sabi)
1356 (the 5th year of King Gongmin)
Renamed to Chungcheong-do
(It’s surmisedthat Yanggwangju-do was called either "Yanggwang-do" or "Chungcheong-do"in the late Goryeo period).
Joseon Dynasty
1396 (the 4th year of King Taejo)
Yanggwang-do was split into two provinces, Gyeonggi-do and Chungcheong-do.
1505 (the 11th year of King Yeonsan)
Chungcheong-do was renamed to Chunggong-do.
1549 (the 4th year of King Myeongjong)
Chunggong-do was renamed to Cheonghong-do.
(After that, Chungcheong-do was renamed in several ways: Gongcheong-do, Chungcheong-do, Gonghong-do, Chunghong-do, and Gongchung-do).
1834 (the 34th year of King Sunjo)
Gongcheong-do was named again as Chungcheong-do.
Aug. 4, 1896 Reorganized from 8 provinces to 13 provinces (Chungnam was organized).
1930’s ~ 1940’s
Oct. 1, 1932
The provincial office was relocated from Gongju to Daejeon.
Oct. 1, 1938
Two villages (Nonsan-myeon and Janghang-myeon) were raised to town status (Eup). (1 Bu [city], 14 Guns [counties], 6 Eups [towns], and 167 Myeons [villages])
Nov. 1, 1940
Yesan-myeon was raised to Eup status.(1 Bu, 14 Guns, 7 Eups, and 165 Myeons)
Oct. 1, 1941
Two villages (Onyang-myeon and Hongseong-myeon) were raised to town status (Eup). (1 Bu, 14 Guns, 9 Eups, and 163 Myeons)
1960’s ~ 1970’s
Jan. 1, 1960
Buyeo-gun was raised to Eup status.
(1 Si, 14 Guns, 12 Eups, and 16 Myeons)
Jan. 1, 1963
Geumsan-gun, Jeonbuk was included in Chungnam.
Yeonmu-myeon was raised to Eup status.
Cheonan-eup was raised to Si status.
(2 Sis, 15 Guns, 15 Eups, and 164 Myeons)
Jul. 1, 1973
Sapgyo-myeon (Yesan-gun), Hapdeok-myeon (Dangjin-gun), Taean-myeon (Seosan-gun), Seonghwan-myeon (Cheonwon-gun) were raised to Eup status.
May 1, 1979
Seocheon-myeon andCheongyang-myeon were raised to Eup status.
(2 Sis, 2 Gus, 15 Guns, 23 Eups, 156 Myeons)
1980’s
Dec. 1, 1980
Anmyeon-myeon (Seosan-gun) was raised to Eup status.
(2 Sis, 2 Gus, 15 Guns, 24 Eups, and 155 Myeons)
Feb. 15, 1983
Boundary adjusted in 15 Eups and Myeons.
(2 Sis, 2 Gus, 15 Guns, 23 Eups, and 154 Myeons)
Oct. 1, 1985
Seonggeo-myeon was raised to Eup status.
(2 Sis, 2 Gus, 15 Guns, 24 Eups, and 153 Myeons)
Jan. 1, 1986
Gongju-eup, Daecheon-eup, and Onyang-eup were raised to Si status.
Jan. 1, 1989
Daejeon-si and Daedeok-gun were split off and promoted to Daejeon Jikhalsi (Directly Governed City) status.
Seosan-eup was raised to Si status.
Taean-gun was split off from Seosan-gun
1990’s
Feb. 1, 1990
Gyeryong Chuljangso (District Office) was organized.
Jan. 1, 1995
8 cities and counties (Gongju-si & Gongju-gun, Daecheon-si & Boryeong-gun, Onyang-si & Asan-gun, and Seosan-si & Seosan-gun) were integrated into 4 cities.(5 Sis, 11 Guns)
May 10, 1995
Cheonan-si and Cheonan-gun were integrated into Cheonan-si.
(5 Sis, 10 Guns)
Mar. 1, 1996
Nonsan-gun was promoted to Si status.
(6 Sis, 9 Guns, 22 Eups, 147 Myeons, and 37 Dongs)
2000’s
Sep. 19, 2003
Gyeryong Chuljangso was raised to Gyeryong-si status (2 Myeons, 1 Dong).
Mar. 18, 2005
Proclaimed a special law of multifunctional administrative city construction (Yeongi-gun Nam-myeon · Geumnam-myeon · Dong-myeon, Gongju-si Janggi-myeon · Banpo-myeon, the whole place)
Feb. 12, 2006
Determined the relocation place of provincial office (Hongseong-gun Hongbuk-myeon · Yesan-gun Sapgyo-eup, the whole place)
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Prehistoric age
Oct. 1, 1932 
