London Underground lines

Name	Map colour	First operated	First section opened *	Name dates from	Type	Length /km	Length /miles	Stations	Journeys per annum (000s)	Average journeys per mile (000s)
Bakerloo line	Brown	1906	1906	1906	Deep level	23.2	14.5	25	104,000	7,172
Central line	Red	1900	1856	1900	Deep level	74	46	49	199,000	4,326
Circle line	Yellow	1884	1863	1949	Subsurface	22.5	14	27	74,000	5,286
District line	Green	1868	1868	1868–1905	Subsurface	64	40	60	188,000	4,700
Hammersmith & City line	Pink	1863	1858	1988	Subsurface	26.5	16.5	29	50,000	3,030
Jubilee line	Grey	1979	1879	1979	Deep level	36.2	22.5	27	127,584	5,670
Metropolitan line	Corporate Magenta	1863	1863	1863	Subsurface	66.7	41.5	34	58,000	1,398
Northern line	Black	1890	1867	1937	Deep level	58	36	50	206,987	5,743
Piccadilly line	Dark Blue	1906	1869	1906	Deep level	71	44.3	53	176,177	3,977
Victoria line	Light Blue	1968	1968	1968	Deep level	21	13.25	16	174,000	13,132
Waterloo & City line	Teal	1898	1898	1898	Deep level	2.5	1.5	2	9,616	6,410
* Where a year is shown that is earlier than that shown for First operated, this indicates that the line operates over a route first operated by another Underground line or by another railway company.

The Underground serves 268 stations by rail; an additional six stations that were on the East London line are served by Underground replacement buses. Fourteen Underground stations are outside Greater London, of which five (Amersham, Chalfont & Latimer, Chesham, Chorleywood, Epping) are beyond the M25 London Orbital motorway. Of the 32 London boroughs, six (Bexley, Bromley, Croydon, Kingston, Lewisham and Sutton) are not served by the Underground network, while Hackney only has Old Street and Manor House on its boundaries.