Japan's population decreased by approximately 3.1 million people between 2020 and 2025 [1].
This record-breaking decline signals an accelerating demographic crisis that threatens the nation's economic stability and the viability of local infrastructure in aging cities.
The drop is the largest five-year decline on record [1]. Data released by the Ministry of Internal Affairs and Communications indicates that the Japanese population stood at 120,296,000 as of Oct. 1, 2024 [2]. This represents a decrease of 898,000 people, or 0.74 percent, compared to the previous year [2].
Localities across the country are feeling the impact. In Yokohama, the Asahi-ku district lost roughly 5,500 residents during the 2020-2025 period [1]. Residents in the area said that public transportation is now dominated by the elderly. "Whether it is buses or trains, it is already nothing but old people. There are no young people," a resident said [1].
Other regions show similar trends. One prefecture reported a population of 1,260,880 in 2025, which was a decrease of 74,753 people from 2020 [3]. The shrinking youth population has led to the closure of educational facilities. One Yokohama resident said that in their time there were many children, but a school that had been added to accommodate them closed 30 years later [1].
Officials said the trend is due to continued low birth rates and an aging society [4]. The decline has persisted because there has been no significant immigration to offset the loss of citizens [4].
“Japan's population decreased by approximately 3.1 million people between 2020 and 2025”
The scale of this population drop indicates that existing government efforts to raise birth rates are not keeping pace with the mortality rate of the baby boomer generation. As urban centers like Yokohama see thousands of residents vanish and schools close, Japan faces a systemic contraction of its workforce and tax base that will likely require a fundamental shift in immigration policy to stabilize.
