The public catalog (1010, read sen-to) of the Tokyo Sento Association, the trade body for the city's licensed public bathhouses. This is a grouping, not a stamp program: member baths share one authoritative catalog and each links to its official 1010 page. The association runs its own seasonal stamp rallies, the sento o-henro ward-by-ward numbering, and themed bath days such as yuzu at the winter solstice.
407 bathhouses
Tokyo Sento (東京銭湯) is the public catalog of the Tokyo Sento Association (東京都公衆浴場業生活衛生同業組合), the trade body for Tokyo's licensed public bathhouses. Its 1010 site (the number reads sen-to) maps every operating sento in the city, from century-old neighbourhood baths with painted Mt. Fuji walls to redesigned modern bathhouses with saunas and outdoor tubs.
A sento is a neighbourhood public bath, distinct from a hot-spring resort: most heat ordinary water, though a good number in Tokyo draw genuine onsen (often the dark "kuroyu" peat water of the Kanto plain). A regular adult bath is relatively inexpensive, with towels, sauna, and other amenities charged separately.
This is a grouping, not an Onsen Oni badge. We list these baths together because they belong to one association and share one authoritative catalog, and we link each one back to its official 1010 page. There is no badge to earn for visiting them.
The association and its ward branches run their own campaigns, and these change from year to year:
1010 listing.For current campaigns, dates, and how to join, see the official site below.
The list on this page is matched to Onsen Oni's own catalog: each bath links through to its full page here, and out to its entry on the association's official site. The association's official site has the most accurate and current information on each bath.