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Seoul Special Metropolitan City Route 21
서울특별시도 제21호선
Siheung - Jungnim Line
Route information
Length	17.7 km (11.0 mi)
Major junctions
From	Geumcheon District, Seoul
To	Jung District, Seoul
Location
Country	South Korea
Highway system
Highway systems of South Korea Expressways National Local

Seoul Metropolitan City Route 21 (Korean: 서울특별시도 제21호선) is a road located in Seoul, South Korea. With a total length of 17.7 km (11.0 mi), this road starts from the Siheung-dong in Geumcheon District, Seoul to Jungnim-dong in Jung District.

Stopovers

Seoul

• Geumcheon District - Gwanak District - Guro District - Dongjak District - Yeongdeungpo District - Yongsan District - Jung District

List of Facilities

IS: Intersection, IC: Interchange

• (■): National Route 1 overlap

Road name	Name	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

References

1. Intersection and interchange are also included , as well as buildings and facilities in the surrounding area

v t e Public transportation in Seoul Metropolitan Area
Railways	Main Gyeongbu Gyeongwon Gyeongui Jungang Gyeongchun Gyeongin AREX High-speed rail Gyeongbu HSR Honam HSR Suseo–Pyeongtaek HSR Metropolitan Subway      Line 1      Line 2      Line 3      Line 4      Line 5      Line 6      Line 7      Line 8      Line 9      Incheon Line 1      Incheon Line 2 Suburban railways      Gyeongui–Jungang Line      Gyeongchun Line      Suin–Bundang Line      Gyeonggang Line      Seohae Line      Shinbundang Line      AREX      Incheon Airport Maglev Light Metro      U Line      EverLine      Ui LRT      Gimpo Goldline      Sillim Line Under construction GTX A Sinansan (2023) Dongbuk (S3) (2024) Planned Seoul LRT lines Myeonmok (S4) (2028) Seobu (S5) (2031) Mok-dong (S6) (2028) Wirye–Sinsa (S7) (2033) Dongtan–Indeogwon (2028) Wirye (2024) Gangbukhoengdan (2027) GTX B GTX C Incheon 3 Main stations Seoul Yongsan Yeongdeungpo Cheongnyangni Suseo Sangbong
Roads	Expressways Gyeongbu (1) () Seohaean (15) Pyeongtaek-Paju (17) Sejong-Pocheon (29) Seoul-Yangyang (60) Seoul Ring (100) Gyeongin (120) Incheon International Airport (130) Yongin-Seoul (171) National roads #1 #3 #6 #39 #43 #46 #47 #48 #77 Local roads #23 #78 Urban expressways Bukbu Dongbu Gangbyeon Gangnam Nambu Naebu Olympic Seobu City routes #20 #21 () #30 #31 #41 () #50 #51 #60 #61 #70 #71 #88 #90 #92 #94
Buses	Areas Seoul Gyeonggi-do [ko] Incheon [ko] Major terminals Seoul Express Bus Terminal Central City Dong Seoul Bus Terminal Sangbong Intercity Bus Terminal [ko] Seoul Nambu Bus Terminal [ko]
Airports	Incheon International Seoul Station City Airport Terminal Gimpo International Seoul Air Base
Related topics	T-money Upass Mybi KTX Family Card hi-pass CashBee [ko] Rail+ [ko]

• Roads in Seoul