Japan's total population fell by approximately 3.1 million people over five years, marking the steepest decline since the first census in 1920 [1, 4].
This demographic collapse signals an accelerating crisis for the world's 12th most populous nation [1]. The rapid shrinkage threatens labor markets and the sustainability of social services as the country struggles with a shrinking birth rate and an aging society [1, 2].
According to preliminary data from the Ministry of Internal Affairs and Communications, the population stood at 123,050,000 people as of Oct. 1, 2025 [2]. This represents a decrease of 3,097,000 people [2] or 2.5% [1] compared to the 2020 census. Other reports place the total population at 123,049,524 [3] with a loss of 3,096,575 people [3].
The decline is widespread across the archipelago. Population growth occurred only in Tokyo and Okinawa, while the remaining 45 prefectures saw decreases [2, 4]. The concentration of people in urban centers has left rural areas hollowed out, with 90% of municipalities reporting population losses [1].
Household structures are also shifting. The average number of people per household has fallen to 2.15 [1]. The Ministry of Internal Affairs and Communications released the preliminary census figures on Oct. 29, 2025 [3].
"Population increase was only in Tokyo and Okinawa, and decreased in 45 prefectures," the ministry said [4].
“Japan's total population fell by approximately 3.1 million people over five years.”
The data confirms a deepening demographic divide within Japan. While Tokyo continues to attract residents from other regions, the systemic loss of 2.5% of the total population in just five years suggests that internal migration cannot offset the national decline. This trend places immense pressure on the government to reform immigration and elderly care policies to maintain economic stability.
