Yi Seong-gye, founder of the Yi Dynasty, retired to the city after a successful palace coup by his son Yi Bang-won in 1400.
Though his son sent envoys to reconcile, his father had them killed.
A modern Korean expression, 'King's envoy to Hamhŭng' (Hamheungchasa), refers to a person who goes on a journey and is never heard from again.
It was known as Kankō during Japanese rule of Korea between 1910 and 1945.
It was liberated by the Red Army on 22 August 1945.

The city was 80–90% destroyed by American air raids during the Korean War (1950-1953) and was occupied by ROK troops between 17 October 1950 and 17 December 1950.
From 1955 to 1962, Hamhŭng was the object of a large-scale program of reconstruction and development by East Germany including the build-up of construction-related industries and intense training measures for Korean construction workers, engineers, city planners and architects.
When the Bauhaus trained architect Konrad Püschel, the first Head of City Planning for the Hamhŭng project arrived in 1955, he was accompanied by about 175 members of the 'Deutsche Arbeitsgruppe (DAG)' as the project team was called.

The project ended two years earlier than scheduled and with a low profile because of the Sino-Soviet conflict and the opposing positions that North Korea and East Germany took on that issue.

From 1960 to 1967, Hamhŭng was administered separately from South Hamgyŏng as a Directly Governed City (Chikhalsi).
Before 1960 and since 1967, the city has been part of South Hamgyŏng Province.

In 1995, Hamhŭng witnessed, thus far, one of the only documented challenges to the North Korean government when famine-ravaged soldiers began a march toward Pyongyang.
The revolt was quelled and the unit of soldiers was disbanded.

The North Korean famine of the 1990s appears to have had a disproportionate effect on the people of Hamhung.
Andrew Natsios, a former aid worker, USAID administrator, and author of The Great North Korean Famine, described Hamhung as "the city most devastated by [the] famine."
Contemporary published reports from The Washington Post and Reuters describe numerous fresh graves on the surrounding hillsides and report that many of Hamhung's children were stunted by malnutrition.
One survivor claimed that more than 10% of the city's population died, with another 10% fleeing the city in search of food.
Despite previously being closed to foreigners, foreign nationals can now travel to Hamhung through the few approved North Korean tour operators.

There is speculation that Hamhung, with its high proportion of chemists and the site of a chemical-industrial complex built by the Japanese during World War II, is the center for North Korea's methamphetamine production.
Yi Seong-gye, founder of the Yi Dynasty, retired to the city after a successful palace coup by his son Yi Bang-won in 1400. Though his son sent envoys to reconcile, his father had them killed. A modern Korean expression, 'King's envoy to Hamhŭng' (Hamheungchasa), refers to a person who goes on a journey and is never heard from again. It was known as Kankō during Japanese rule of Korea between 1910 and 1945. It was liberated by the Red Army on 22 August 1945.
The city was 80–90% destroyed by American air raids during the Korean War (1950-1953) and was occupied by ROK troops between 17 October 1950 and 17 December 1950. From 1955 to 1962, Hamhŭng was the object of a large-scale program of reconstruction and development by East Germany including the build-up of construction-related industries and intense training measures for Korean construction workers, engineers, city planners and architects. When the Bauhaus trained architect Konrad Püschel, the first Head of City Planning for the Hamhŭng project arrived in 1955, he was accompanied by about 175 members of the 'Deutsche Arbeitsgruppe (DAG)' as the project team was called.
The project ended two years earlier than scheduled and with a low profile because of the Sino-Soviet conflict and the opposing positions that North Korea and East Germany took on that issue.
From 1960 to 1967, Hamhŭng was administered separately from South Hamgyŏng as a Directly Governed City (Chikhalsi). Before 1960 and since 1967, the city has been part of South Hamgyŏng Province.
In 1995, Hamhŭng witnessed, thus far, one of the only documented challenges to the North Korean government when famine-ravaged soldiers began a march toward Pyongyang. The revolt was quelled and the unit of soldiers was disbanded.
The North Korean famine of the 1990s appears to have had a disproportionate effect on the people of Hamhung. Andrew Natsios, a former aid worker, USAID administrator, and author of The Great North Korean Famine, described Hamhung as "the city most devastated by [the] famine." Contemporary published reports from The Washington Post and Reuters describe numerous fresh graves on the surrounding hillsides and report that many of Hamhung's children were stunted by malnutrition. One survivor claimed that more than 10% of the city's population died, with another 10% fleeing the city in search of food. Despite previously being closed to foreigners, foreign nationals can now travel to Hamhung through the few approved North Korean tour operators.
There is speculation that Hamhung, with its high proportion of chemists and the site of a chemical-industrial complex built by the Japanese during World War II, is the center for North Korea's methamphetamine production.
Hamhung