A neighbourhood that grew up after the Keio Line arrived, where a ridge-top park with paddy fields lies five minutes from the station
The closest neighborhoods in the same city.
Oyamagaoka, the area around Tamasakai Station, is the westernmost planned residential district of Tama New Town. A 5-minute walk from the east exit takes you into Tokyo Metropolitan Oyama-dairi Park. The park covers about 46 hectares (part of it on the Hachioji side), and the open areas have lawns, ponds, and paddy fields; the Oneryokudo greenway, which runs along the ridgeline, is a jogging route.
Oyama-machi, also part of this neighborhood, stretches long and narrow from east to west; after the Keio Sagamihara Line opened in 1990, homes went up across the whole district. In 2020, one in six people in this neighborhood was under 15, households of three or more people made up nearly half, and just over seven in ten households owned their home.
Going by our street photos, greenery ranks 58th among 395 neighborhoods in Tokyo, the strongest ranking in this neighborhood. Cleanliness also ranks 98th.
Most of Oyama-dairi Park is a protected area that's closed to the public; the open parts are always open and free to enter. In 2023, Keio opened a building in front of the station at the east exit, with a supermarket and a drugstore inside.
Convenience ranks 382nd among 395 neighborhoods. The station is Keio's only one in Machida City; neither the Special Express nor the Express stops here—only the Semi Express, Rapid, and Local trains do.
The neighborhood isn't all residential, either: the 2-chome area has an industrial park, and there are large discount stores around the station. Going by our street photos, buildings rank 388th, the weakest showing in this neighborhood. Garbage from this area is sent to a cleaning plant in Tama City, and the sorting rules differ somewhat from the rest of Machida City.
The Oneryokudo greenway began as a road an Army arsenal built along the ridgeline during World War II to test tanks. When Keio extended the Sagamihara Line, there was originally no plan to put a station here; it was the Machida mayor and city council who lobbied for it.
The station's name draws on three meanings of 'sakai' (border): the boundary of Tama New Town, the border between Tokyo and Kanagawa Prefecture, and the nearby Sakai River. To meet the requirements for construction subsidies, Keio first extended the line all the way to Hashimoto, and this station opened a year later, in 1991.
In 1999, the Across Tamasakai shopping center opened at the west exit. In 2004 this area was designated Oyamagaoka, and Oyama-dairi Park opened the same year. Across Tamasakai closed and was demolished entirely in 2012, and for several years afterward there was no supermarket or drugstore in front of the station—only a convenience store.
Compared with the 395 Tokyo neighborhoods in this guide (scores 0–10)
Hospitals with inpatient beds (2020 data), public elementary and junior high schools whose catchment covers this area, high schools and universities within 1 km, stations, parks of 1 ha or more, and large shopping malls and department stores. Many Tokyo junior high students attend private schools, so junior high catchments are only a guide.
Maps show the shops and the sights. What a street is like, you only know by walking it. TidyMap uses AI street imagery analysis and public facility data to turn each area's street environment and everyday convenience into something you can compare. Search an address and look at the street outside first.
How to read it: yellow = poor, blue = good; grey = not enough data
TidyMap rates the street environment and everyday convenience. It does not assess the home itself, safety, noise or actual living experience. Street environment scores use AI assessments of imagery; convenience scores use public facility data.
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