Seoul Subway Line 4 is a long line crossing from the southwest to the northeast across the Capital Metropolitan Area. The southern portion of the line is divided into the Gwacheon and Ansan Lines, but this does not affect the trains which run on it, most of which run all the way from one end of the line to the other. The southern terminus (Oido) is in Jeongwang 4-dong, Siheung City, and the northern terminus (Danggogae) in Sanggye 4-dong, Nowon-gu, northern Seoul. Including these stops, from south to north, trains on the line stop at:
Ansan Line
In Siheung
- Oido
- Jeongwang -- for Korea Polytechnic University
- Singil Oncheon
Gwacheon Line
In Gunpo
- Geumjeong -- transfer to Line 1
- From this point north, most of the line runs below ground
- Beomgye
- Pyeongchon
- Indeogwon
- Government Complex Gwacheon
- Gwacheon
- Seoul Grand Park -- for Seoul Grand Park and Seoul Land
- Seoul Racecourse Park
- Seonbawi
Main Line (entirely in Seoul)
- Namtaeryeong
- Sadang -- transfer to Line 2
- Chongshin University, or Isu -- for Chongshin University; transfer to Line 7
- Dongjak
- at this point, the line crosses the Han River
- Ichon -- transfer to Line 1
- Sinyongsang -- for the Yongsan Electronics Market
- Samgakji -- transfer to Line 6
- Sookmyung Women's University -- for Sookmyung Women's University
- Seoul Station -- transfer to the Korean National Railroad and Line 1
- Hoehyeon -- for Namdaemun Market
- Myeongdong
- Chungmuro -- transfer to Line 3
- Dongdaemun Stadium -- transfer to Line 2
- Dongdaemun -- for Dongdaemun Market; transfer to Line 1
- Hyehwa
- Hansung University -- for Hansung University
- Sungshin Women's University -- for Sungshin Women's University
- Gireum
- Mia-samgeori
- Mia
- Suyu
- Ssangmun
- Changdong -- transfer to Line 1
- Nowon -- transfer to Line 7
- Sanggye
- Danggogae
