Omori (Tokyo · JR East)

Weekday departures: 954/day in the available timetable data · Sat & holiday departures: 430/day in the available timetable data

Earliest / latest departure in the available data (weekday): 4:26 / 24:52 (00:52 next day)

Busiest hour in the available data: 11:00–12:00 (67)

0:00 ─ 23:00

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

Timetable data as of 3 May 2026.

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 incomplete:

• Tokaido Main Line: timetable covers only part of the line

• Tokaido Main Line: Oimachi ⇄ Kamata (Tokyo)

Ōmori Station opened on 12 June 1876 — four years after the original Shinbashi–Yokohama line — as one of the early additions to the government railways. Originally a maintenance hut for track-watchers, the structure was converted into a station when its operational role lapsed. The line was double-tracked toward Kawasaki on 1 March 1879 and toward Shinagawa on 14 November 1880. After Keihin commuter electric services began on 20 December 1914 locomotive-hauled trains increasingly ran through without stopping, and from 15 March 1930 every passenger train on the main-line tracks passed the station, leaving it served by the electric commuter trains alone; the disused main-line platform survived for decades and was demolished during the station's rebuilding, by 1984. The new station building was completed in July 1984, and the station's commercial complex opened on 14 September 1984 as Ōmori Primo, taking the name Atré Ōmori in 2005. JR East assumed operation on 1 April 1987. Station number JK 18 sits on the Keihin-Tōhoku Line.

In 1877, American zoologist Edward S. Morse spotted the Ōmori Shell Mounds from the train window just after departing this station — the discovery is considered the birthplace of Japanese archaeology, commemorated by a monument on the platform installed in September 1977.