Structural Analysis of Local Government 'Extinction' — 744 Municipalities Face the Critical Point of Population Decline and Fiscal Crisis

In April 2024, the "Population Strategy Council," a private advisory group, published a new report. Of the nation's 1,729 municipalities, 744 (43.0%) were classified as "municipalities at risk of extinction"—local governments where the population of women aged 20-39 is projected to decline by 50% or more by 2050.

The 2014 Masuda Report (Japan Policy Council) identified 896 such municipalities. While approximately 150 municipalities appear to have moved out of the risk category over the past decade, this "improvement" is mainly attributable to increases in foreign residents and social population growth in some municipalities due to childcare support measures. Very few municipalities have seen actual improvements in birth rates.

More concerning is the emergence of a new category called "Black Hole municipalities." Twenty-five municipalities, including Tokyo's 23 special wards, function as "population black holes"—attracting population while maintaining extremely low birth rates. This structure absorbs young women from rural areas but produces few children, accelerating nationwide population decline.

The "Determined Future" of Demographics

Population decline is not a prediction. The productive-age population 20 years from now is almost predetermined by the number of children already born—or not born.

Births in 2024 numbered approximately 686,000. The total fertility rate in 2023 hit a record low of 1.20. According to projections by the National Institute of Population and Social Security Research, Japan's total population will be approximately 104.68 million in 2050 (a 17% decline from 2020) and shrink to 87 million by 2070.

This decline will not occur uniformly. While Tokyo's concentration continues to intensify, population decline in regional areas is accelerating. The rate of municipalities at extinction risk reaches 63.4% in Hokkaido and Tohoku, and 63.3% in Kyushu and Okinawa. The "uneven distribution" of population is expanding further, leading to the hollowing out of national territory.

Structural Vulnerability of Municipal Finances

Population decline immediately erodes revenue. Resident taxes, property taxes, and local consumption taxes—all core municipal revenues are linked to population and economic activity. When population declines, tax revenues fall, but the cost of maintaining public infrastructure does not decrease proportionally. Roads, bridges, water and sewerage systems, public facilities—these maintenance and renewal costs are fixed expenses that occur regardless of usage levels.

According to Ministry of Internal Affairs and Communications' "Comprehensive Management Plans for Public Facilities," the infrastructure renewal costs needed nationwide over the next 30 years are estimated at approximately 190 trillion yen. At current investment levels (about 5 trillion yen annually), there would be an annual shortfall of approximately 1.3 trillion yen.

While the local allocation tax system provides fiscal adjustment functions, the allocation tax is funded by fixed percentages of five national taxes (income tax, corporate tax, liquor tax, consumption tax, and local corporate tax). If national tax revenues shrink, allocation taxes will also shrink. With 93% of municipalities having a fiscal capacity index below 1.0, the sustainability of this system is structurally questioned.

What Happens Before "Extinction"

Municipalities do not physically disappear. However, when population decline exceeds certain thresholds, municipalities can no longer maintain their "functions."

The first stage is already underway across wide areas. More municipalities are entering the second stage, making structural responses ahead of 2040 increasingly urgent.

While the provocative term "extinction risk" draws attention, the essential question is not "whether they will disappear." Given that population decline is inevitable, this is fundamentally a system design issue of how to redesign municipal functions and resident services.

First Structure—"Population Concentration and Tokyo's Black Hole Effect." The structure where young women from regional areas move to the Tokyo metropolitan area, while the Tokyo area maintains the nation's lowest birth rate (Tokyo: 0.99), functions as a mechanism that accelerates nationwide population decline. A comprehensive review of the ten years when regional revitalization policies could not counter this dynamic is necessary.

Second Structure—"The Curse of Fixed Costs." When population halves, bridge maintenance costs do not halve. Water and sewerage pipeline lengths do not shorten. This "mismatch between fixed costs and variable revenues" structurally pressures municipal finances under population decline. Selection and concentration—compact city development and location optimization plans—are rational, but coordinating with the living rights of residents "on the consolidation side" becomes an extremely difficult political challenge.

Third Structure—"Institutional Limits of Wide-Area Cooperation." The Ministry of Internal Affairs and Communications promotes wide-area cooperation (core city regions, settlement-based independence zones), but coordination costs among participating municipalities are high, limiting effectiveness. The 2040 vision for municipal administration presented municipalities as "platform builders," but shortages of personnel and expertise to fulfill this role remain constraints.

The figure of 744 is a quantitative manifestation of the contradictions in Japan's territorial structure. Confronting this contradiction requires the resolve to question the very premise of "maintaining all municipalities" and the presentation of an alternative national land vision.

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References

FY2024 Municipal Sustainability Analysis Report — Population Strategy Council. Population Strategy Council

Population Projections for Japan (2023 Estimate) — National Institute of Population and Social Security Research. IPSS

Municipal Strategy 2040 Study Group: Second Report — Ministry of Internal Affairs and Communications. MIC

Survey on the Status of Public Facility Comprehensive Management Plans — Ministry of Internal Affairs and Communications. MIC

Recommended Reading

Unequal Society

Toshiaki Tachibanaki

The book that sparked Japan's inequality debate, empirically documenting the widening income gap and stratification.

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Local Extinction — Population Collapse Driven by Tokyo Concentration

Hiroya Masuda

The book that introduced the concept of 'municipalities at risk of disappearing,' launching a nationwide debate on population decline and local government sustainability.

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Rotting Infrastructure — Another Approaching Crisis

Yuji Nemoto

Empirical analysis of accelerating infrastructure deterioration under population decline, proposing PPP-based public facility restructuring. Essential for understanding the physical dimension of municipal extinction.

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