Oimachi

Weekday departures: 1,152/day in the available timetable data · Sat & holiday departures: 555/day in the available timetable data

Earliest / latest departure in the available data (weekday): 4:28 / 24:49 (00:49 next day)

Busiest hour in the available data: 8:00–9:00 (81)

0:00 ─ 23:00

Figures are typical departures in the timetable data, not a live service count.

Timetable data as of 3 May 2026 to 13 May 2026: the timetables behind these figures were retrieved on different dates.

The timetable data is incomplete for some or all lines at this station, so the weekday and Sat & holiday figures are departures in the available timetable data, not totals.

Lines where the timetable data is complete: Tokyu Oimachi Line

Lines where the timetable data is incomplete:

• Rinkai Line: timetable data withheld pending licensing
• Tokaido Main Line: timetable covers only part of the line

• Tokyu Oimachi Line: Shimo-simmei
• Tokaido Main Line: Shinagawa ⇄ Omori (Tokyo · JR East)

Ōimachi began as a Tōkaidō Main Line junction on 15 March 1901, gaining full station status on 20 December 1914 with the inauguration of the Keihin Line (today's Keihin-Tōhoku Line). The connecting Yamanote Line spur to Ōsaki ran from August 1901 until 16 April 1916. Meguro-Kamata Electric Railway's Ōimachi Line opened from here on 6 July 1927. The JNR station passed to JR East at privatisation on 1 April 1987. Atré Ōimachi opened with a new east-west free passage on 11 March 1993, and TWR's Rinkai Line station joined the complex on 1 December 2002.

Between 2011 and 2021, the Rinkai Line platforms used a rotating set of Shiki Theatre Company musical themes as departure melodies, including 'Beauty and the Beast', 'Under the Sea' and 'Memory' from Cats, the station being the nearest to both the Shiki Theatre [Natsu] and the Cats Theatre where those shows were staged.