Various other parts were merged into the district, and it was promoted to si (city) in 1969, also becoming the capital of South Pyongan Province.

[4] In 1995, Toksong-dong, Paesan-dong, Songnyong-dong and a part of Jikyong-dong were split from the city and placed under the jurisdiction of Pyongyang through Unjong-guyok.

[5] P'yŏngsŏng-si is divided into 20 dong (neighbourhoods) and 14 ri (villages): The city has small scale nuclear and physics research facilities, which are controlled by the State Academy of Sciences.

It is also more efficient to send goods to the east coast cities of Wonsan than directly from Sinuiju.

[12] A temporary structure was built in 2017, which appeared to be used to support the development of TEL vehicles, similar to those at the No.65 Factory at Jonchon.

[12] Having been initially established with the idea of functioning as a center for North Korea's science and technology sectors, Pyongsong-si is the location of several colleges, universities, and research center: Pyongsong is located at an average of 100–200 metres above sea level, although the western part of the city is mostly mountains.

[18] P'yŏngsŏng-si has two stations on the P'yŏngra Line of the Korean State Railway, one in P'yŏngsŏng-dong and one in Ponghak-dong.

The network opened on August 4, 1983, from Munwha-dong to Pyongsong station and extended in 1992 by 5.2 km to Paesan-dong.