The Northern Line is a line with seven sections. It passes through north London from three termini, crosses the centre between Camden Town and Kennington by two routes, and has two branches in south London.
| High Barnet to Camden Town 17.8km — 144m ascent | Map | Directions |
| Edgware to Camden Town 15.2km — 156m ascent | Map | Directions |
| Mill Hill East to Finchley Central 1.9km — 35m ascent | Map | Directions |
| Camden Town to Kennington via Charing Cross 7.8km — 10m ascent | Map | Directions |
| Camden Town to Kennington via Bank 11.0km — 39m ascent | Map | Directions |
| Kennington to Battersea Power Station 4.4km — 0m ascent | Map | Directions |
| Kennington to Morden 13.5km — 27m ascent | Map | Directions |
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