Where Japanese Residents Are Leaving: Kawaguchi 4th, Nagasaki 5th in Net-Outflow Ranking
- Toyo Keizai ranks municipalities by 2025 net outflow of Japanese residents, using government data
- Nagasaki City ranks 5th; Kawaguchi in Saitama ranks 4th
- Resident migration rivals births and deaths in shaping local decline
- Net-outflow cities face pressure on housing demand and land prices
Before buying Japanese property, check where people are going. Toyo Keizai's ranking of municipalities losing the most Japanese residents in 2025—built on internal affairs ministry data—puts Nagasaki City 5th and Kawaguchi, Saitama 4th. Migration hits real estate harder and faster than demographics: when residents leave, tenants and buyers vanish with them.
Kawaguchi is the telling case: a classic cheap-commute suburb of Tokyo where Japanese outflow coincides with foreign inflow, quietly rewriting the local rental market. Nagasaki typifies regional hub bleed after shipbuilding cutbacks. For overseas investors, the lesson is to verify whether a 'cheap' suburban asset is undervalued or depopulating, and to discount high headline yields in regional cities by population dynamics. The ministry's annual migration report, free and honest, is the best site-selection tool available.