| Country: | KOR |
| Type: | Seoul |
| Route: | 21 |
| Alternate Name: | Siheung - Jungnim Line |
| Length Km: | 17.7 |
| Terminus A: | Geumcheon District, Seoul |
| Terminus B: | Jung District, Seoul |
Seoul Metropolitan City Route 21 is a road located in Seoul, South Korea. With a total length of 17.7km (11miles), this road starts from the Siheung-dong in Geumcheon District, Seoul to Jungnim-dong in Jung District.
IS: Intersection, IC: Interchange
| Road name | Name [1] | Hangul name | Connection | Location | Note | |||
|---|---|---|---|---|---|---|---|---|
| Connected with Gyeongsu-daero | ||||||||
| Siheung-daero | National Route 1 Gyeongsu-daero | Geumcheon District | Siheung 3-dong | |||||
| Samseongsan-gil | Unnamed | |||||||
| Siheung-daero 6-gil | ||||||||
| Siheung-daero 8-gil | ||||||||
| Gia Bridge | 기아대교앞 | Gia-ro | ||||||
| Siheung-daero 28-gil | Unnamed | |||||||
| Siheung-daero 36-gil | ||||||||
| Siheung-daero 39-gil | Siheung 3-dong | Siheung 1-dong | ||||||
| Bakmi IS | 박미삼거리 | Doksan-ro | Siheung 5-dong | |||||
| Eunpyeongnamu-ro | Siheung 1-dong | Unnamed | ||||||
| Siheung-daero 51-gil | ||||||||
| Siheung IS | 시흥사거리 | National Route 1 Geumha-ro | ||||||
| Geumcheon-gu Office Entrance | 금천구청입구 | Siheung-daero 71-gil | ||||||
| Siheung-daero 73-gil | ||||||||
| Siheung-daero 90-gil | Doksan 1-dong | Doksan 2-dong | Unnamed | |||||
| Malmi IS | 말미사거리 | Beoman-ro | ||||||
| Doksan 4-dong | ||||||||
| Geumcheon Post Office | 금천우체국 | Dusan-ro | ||||||
| Siheung-daero 122-gil | ||||||||
| Doksan IS | 독산사거리 | Gasan-ro | ||||||
| Doksan 3-dong | ||||||||
| Siheung-daero 150-gil | Unnamed | |||||||
| Siheung IC | 시흥나들목 | Nambu Beltway | ||||||
| Digital-ro 31ga-gil | ||||||||
| Siheung-daero 161-gil | Guro District | Guro 3-dong | Gwanak District | Jowon-dong | ||||
| Siheung-daero 161ga-gil | ||||||||
| Digital Complex Entrance | 디지털단지입구 | Digital-ro 32-gil | ||||||
| Siheung-daero 164-gil | ||||||||
| Guro Digital Complex station | 구로디지털단지역 | Sinsa-ro | ||||||
| Guro Bridge (Dorimcheon) | 구로교 (도림천) | |||||||
| Yeongdeungpo District | Daerim 2-dong | Dongjak District | Sindaebang 1-dong | |||||
| Daerim IS | 대림사거리 | Daerim-ro | ||||||
| Daerim 1-dong | ||||||||
| Siheung-daero 187-gil | Unnamed | |||||||
| Daerim IS | 대림삼거리 | Singil-ro | ||||||
| Yeouidaebang-ro | Singil 6-dong | |||||||
| Yeouidodaebang-ro 2-gil | Unnamed | |||||||
| Yeouidodaebang-ro 10-gil | ||||||||
| Sindaebang 2-dong | ||||||||
| Boramae Park Entrance | 보라매공원입구 | Yeouidodaebang-ro 20-gil | ||||||
| Daebangcheon IS | 대방천사거리 | Daebangcheon-ro | ||||||
| Yeouidodaebang-ro 24-gil | Daebang-dong | |||||||
| Boramae station | 보라매역 | Sangdo-ro | ||||||
| Sinpung-ro | ||||||||
| Navy Hall | 해군회관앞 | Gamasan-ro | Singil 7-dong | |||||
| Yeouidodaebang-ro 36-gil | ||||||||
| Sungnam High School Entrance | 성남고교입구 | Yeouidodaebang-ro 43-gil | ||||||
| Yeouidodaebang-ro 46-gil | Unnamed | |||||||
| Yeouidodaebang-ro 49-gil | ||||||||
| Daebang Underpass (Gyeongbu Line) | 대방지하차도 (경부선) | Yeongdeungpo District | Singil 7-dong | |||||
| Yeoui Bridge (Yeouido Saetgang) | 여의교 (샛강) | Dongjak District | Daebang-dong | |||||
| Yeongdeungpo District | Yeoui-dong | |||||||
| Yeoui Bridge IS | 여의교오거리 | Uisadang-daero | ||||||
| Yeouidong-ro | ||||||||
| Yeouidodaebang-ro 65-gil | Unnamed | |||||||
| Hanyang Apartment | 한양아파트앞 | Gukjegeumyung-ro | ||||||
| Wonhyo Bridge (Hangang) | 원효대교 (한강) | |||||||
| Cheongpa-ro | Yongsan District | Wonhyoro 2-dong | Ichon 2-dong | |||||
| Wonhyo-ro | Hangangro-dong | Unnamed | ||||||
| Cheongpa-ro 20-gil | ||||||||
| Yongsan Electronics Market | 용산전자상가 | Saechang-ro | ||||||
| Ukcheon Overpass (Yongsan Line) | 욱천고가 (용산선) | |||||||
| Wonhyoro 1-dong | ||||||||
| Wonhyo-ro 90-gil | Unnamed | |||||||
| Namyeong station | 남영역 | Wonhyo-ro | ||||||
| Hangang-daero 77-gil | Cheongpa-dong | |||||||
| Cheongpa-ro 45-gil | Unnamed | |||||||
| Hangang-daero 87-gil | ||||||||
| Sookmyung Women's University Entrance | 숙명여대입구 | Cheongpa-ro 47-gil | ||||||
| Cheongpa-ro 71-gil | Unnamed | |||||||
| Cheongpa-ro 85-gil | Cheongpa-dong | Namyeong-dong | ||||||
| Seoul Station (West) | 서울역서부 | Mallijae-ro | Jung District | Jungnim-dong | Hoehyeon-dong | |||
| Jungnim-ro | ||||||||
| Jungnim-dong IS | 중림동삼거리 | Chilpae-ro | ||||||
| Cheongpa-ro 103-gil | ||||||||
| Seoul Waterworks Office IS | 상수도사업본부삼거리 | Seosomun-ro | Jungnim-dong | |||||