This city has the largest municipal area among the municipalities of this country. When, around a mountain castle town, it merged the nine surrounding towns and villages in the Heisei mergers, its municipal area spread to rival an entire prefecture. At its center is an old townscape that strongly retains the look of the Edo-era castle town and merchant town, and its three streets are guarded as a National Important Preservation District for Groups of Traditional Buildings. This city, which became the largest municipal area in Japan around a mountain castle town, raised its population once with the merger and now has quietly lost it. Takayama’s numbers are the record of a city inscribed with the history of the castle town of Hida and nine towns and villages.
A city in the northern part of Gifu Prefecture, centered on a castle town that opens in the mountains of Hida. To read its population, one must take the merger into account. In 2005 Takayama City merged the nine surrounding towns and villages, spreading its municipal area to rival an entire prefecture. The 2000 population of the former Takayama City before the merger was 66,430, and after the merger, in 2005, it was 96,231. From there it moved to 84,419 in 2020. What I (Atlas) want to read here is not the sign "the tourist destination of Hida," but the causal thread: how the history of the castle town of Hida and nine towns and villages is translated into today’s population and finances.
01 · See the present Takayama City in its numbers
In the latest Population Census the population is about eighty-four thousand (84,419 in 2020). To read this city’s population, one must take the merger into account. In 2005 Takayama City merged the nine surrounding towns and villages, spreading its area to about 2,177 square kilometers — the largest municipal area among the municipalities of this country. The 2000 population of the former Takayama City before the merger was 66,430, and after the merger, in 2005, it was 96,231. The step in population between 2000 and 2005 in this article mirrors this expansion of the municipal area by the merger. From there it fell gently after the merger, to 92,747 in 2010, 89,182 in 2015 and 84,419 in 2020.
Looking inside the figures, the figure of a vast city centered on a mountain castle town appears. The share aged 65 and over rose from 19.6% in 2000 to 33.3% in 2020, past three in ten. The employment rate is on the higher side at 62.8% in 2020, the household-with-children share is 22.6% in 2020, and the Childcare Waitlist was zero in both 2024 and 2025. The Fiscal Capacity Index was 0.53 in fiscal 2023 — a middling level whose own tax revenue can cover a little over half of expenditure. The figure of the castle town with the largest municipal area in Japan, losing population after the merger while its aging advances, appears in the numbers. Why it takes this shape cannot be read without going back over the history of the castle town and the nine towns and villages.
Source: Population Census (Statistics Bureau, MIC) / Local Government Finance Survey, Fiscal Capacity Index (MIC) / Childcare Facility Status Report (Children and Families Agency) / Real Estate Information Library (MLIT)
02 · The mountain castle town of Hida, the old townscape, the Heisei merger of nine towns and villages, the largest municipal area in Japan — the history behind the numbers
This city’s skeleton is set by the mountain castle town of Hida and the nine towns and villages merged in the Heisei mergers. The opening layer is the castle town. This city is centered on a castle town that opens in the mountains of Hida. In the Edo era this was a castle town, and it developed as a merchant town. Along the three streets of the center, the townhouses of that time stand in rows, and as an old townscape that strongly retains the look of the Edo era they were chosen as a National Important Preservation District for Groups of Traditional Buildings. The mountain castle town and the merchant town are the history of this city’s center.
Upon this castle town, the Heisei merger overlapped. In 2005 this city merged the nine surrounding towns and villages. When it merged the nine towns and villages spread through the mountains, its municipal area, at about 2,177 square kilometers, came to rival an entire prefecture and became the largest among the municipalities of this country. Around a mountain castle town, binding vast forests and villages into a single municipal area — that is the make-up of this city. The mountain castle town of Hida, the old townscape, the Heisei merger of nine towns and villages, and the largest municipal area in Japan — this city’s shape stands upon the history of the castle town and the merger that the mountain castle town of Hida held.
Source: Takayama City / the old townscape of Hida-Takayama (the three streets of Kami-machi and Shimo-machi that developed as the Edo-era castle town and merchant town = a National Important Preservation District for Groups of Traditional Buildings, retaining the look of the Edo era — overview) / Takayama City (city status in 1936 → on 2005-02-01 it incorporated nine surrounding towns and villages (Nyukawa / Kiyomi / Shokawa / Miya / Kuguno / Asahi / Takane / Kokufu / Kamitakara) and, with an area of about 2,177 km², became the largest municipality by area in Japan; the castle town of Hida — overview)
03 · In the castle town with the largest municipal area in Japan, losing population after the merger and advancing its aging
What characterizes Takayama City is that, holding the history of the mountain castle town of Hida and having become the largest municipal area in Japan, it has lost population after the merger and advanced its aging. From 96,231 after the merger in 2005 to 84,419 in 2020, it fell by some twelve thousand over fifteen years. Even in this vast city centered on a mountain castle town, a part of the younger generation moved to the larger nearby cities, and, combined with the aging of the mountain villages added by the merger, the age of the whole city has risen, as it can be read. That the share aged 65 and over passed three in ten at 33.3% in 2020 is an expression of this.
On the other hand, the employment rate is on the higher side at 62.8% in 2020. It can be read that in the mountain castle town the trades of tourism, handicrafts and forestry have rooted, keeping the share of those who work on the higher side. The Childcare Waitlist was zero in both 2024 and 2025, and the household-with-children share is 22.6% in 2020. The Fiscal Capacity Index of 0.53 is a middling level whose own tax revenue can cover a little over half of expenditure. It can be read that the income of the households living in the mountain castle town supports the tax source at the middling level. The castle town with the largest municipal area in Japan now loses population after the merger while advancing its aging. The population fell after the merger, the aging passed three in ten, the employment rate is on the higher side, and the fiscal stamina is middling. Re-stated as having held, within a municipal area rivaling a prefecture, both the center of the castle town and the mountain villages whose aging advances, these four numbers can be read as a single, continuous composition.
Source: Population Census (Statistics Bureau, MIC) / Local Government Finance Survey, Fiscal Capacity Index (MIC) / Childcare Facility Status Report (Children and Families Agency)
04 · The castle town of Hida that became the largest municipal area in Japan by merging nine towns and villages
Takayama holds several functions of its own. One is the mountain castle town of Hida, with the history of retaining as a National Important Preservation District for Groups of Traditional Buildings an old townscape that developed as a merchant town. Another is the character that, by merging the nine surrounding towns and villages in the Heisei mergers, it became the largest municipal area by area among the municipalities of this country. And this landform of the mountains of Hida set a castle town at the center and bound vast forests and villages into a single municipal area.
Takayama is a city where the castle town of Hida, merging nine towns and villages, became the largest municipal area in Japan. From the mountain castle town of Hida, through the old townscape, the Heisei merger of nine towns and villages, to the largest municipal area in Japan — the geography of "the mountains of Hida" set the castle town and bound a vast municipal area through the merger. Under the name of a single city, the three streets of townscape retaining the look of the Edo era and forests rivaling a prefecture dwell together. The very breadth of the city carries within it the low density and the aging of the mountain villages.
Source: Takayama City / the old townscape of Hida-Takayama (the three streets of Kami-machi and Shimo-machi that developed as the Edo-era castle town and merchant town = a National Important Preservation District for Groups of Traditional Buildings, retaining the look of the Edo era — overview) / Takayama City (city status in 1936 → on 2005-02-01 it incorporated nine surrounding towns and villages (Nyukawa / Kiyomi / Shokawa / Miya / Kuguno / Asahi / Takane / Kokufu / Kamitakara) and, with an area of about 2,177 km², became the largest municipality by area in Japan; the castle town of Hida — overview)
05 · Atlas note — only the breadth of the municipal area and the net of trades that fills it remain as footing
Lay out Takayama’s numbers and the indicators of a vast city centered on a mountain castle town line up: a population falling after the merger, an aging rate of 33.3%, an employment rate of 62.8%, and a fiscal capacity of 0.53. But what I (Atlas) want to read, looking at this city with the accountant’s eye, is the sense of scale in this city’s history of holding "a municipal area rivaling an entire prefecture." When, around a mountain castle town, it merged the nine surrounding towns and villages in the Heisei mergers, its municipal area became the largest by area among the municipalities of this country. Under the name of a single city, a castle town, vast forests, and many mountain villages are bound together. The composition in which the breadth of the municipal area carries within it the low density of population and the aging of the mountain villages explains this city’s numbers well.
One more thing to weigh is that this city’s employment rate is on the higher side at 62.8% in 2020. While losing population and advancing its aging past three in ten, the share of those who work is kept on the higher side. The thread that, in the castle town retaining the look of the Edo era, the trades of tourism, handicrafts and forestry have rooted and connect the places to work fits the numbers well. From this city, which by merging the nine surrounding towns and villages in the Heisei mergers became the largest municipal area by area among the municipalities of this country, let me count what remains at the last once the excess is shaved away. Two things remain. One is the breadth of the municipal area itself, which holds together both the center of the castle town and the mountain villages whose aging advances. The other is the net of trades, where in every corner of that broad municipal area the trades of tourism, handicrafts and forestry connect the places to work. The breadth carries the low density and the aging of the villages; the net of trades supports the share of those who work. In this city, which around a castle town retaining the look of the Edo held the largest municipal area by area in this country, in the end only that breadth, and the net of trades that fills the breadth, remain in hand as sure footing.
Source: Population Census (Statistics Bureau, MIC) / Takayama City / the old townscape of Hida-Takayama (the three streets of Kami-machi and Shimo-machi that developed as the Edo-era castle town and merchant town = a National Important Preservation District for Groups of Traditional Buildings, retaining the look of the Edo era — overview) / Takayama City (city status in 1936 → on 2005-02-01 it incorporated nine surrounding towns and villages (Nyukawa / Kiyomi / Shokawa / Miya / Kuguno / Asahi / Takane / Kokufu / Kamitakara) and, with an area of about 2,177 km², became the largest municipality by area in Japan; the castle town of Hida — overview)
Editor’s note: all figures and sources are drawn from official statistics. The prose follows Atlas’s voice, and AI (atlas-handcrafted-reverse-v1 (Daiki 2026-06-02)) handled the shaping of the text. Evaluative or predictive language (such as “a good buy” or “attractive”) is intentionally left out. Revision id: wave22_8