This town spreads over a gentle plateau adjoining a large city to the north. On the plateau, watermelons still ripen, and the scenery of fields and pasture remains. But onto that farming plateau, young households commuting to the neighboring large city came to live one after another, and the population has kept rising. The household-with-children share is, for a regional city, conspicuously high. This land of a farming plateau adjoining a large city to the north bound two towns into one to become a city, and has increased its population after the merger. Amid many regional cities losing population, the numbers of this plateau that has increased have a reason of their own. Koshi’s numbers are the record of a town in which young households and population growth are inscribed.
A city that opens on the plateau adjoining Kumamoto City to the north, in Kumamoto Prefecture. Because this city was established in 2006 by binding two towns anew into one, its population statistics for the city area cover the period from 2010, after the merger, on — the period the Census reflects. From the 55,002 of 2010 to the 61,772 of 2020, it has increased. What I (Atlas) want to read here is not the sign "a city near Kumamoto," but the causal thread: how the past of young households and population growth is translated into today’s population and finances.
01 · Seeing the present Koshi in its numbers
In the latest Population Census the population is about 62,000 (61,772 in 2020). Because this city was established in 2006 by binding two towns anew into one, its population statistics for the city area cover the period from 2010, after the merger, on — the period the Census reflects. From the 55,002 of 2010, to the 58,370 of 2015, to the 61,772 of 2020, it has increased.
Looking inside, the figure of a plateau city that gathers young households commuting to the neighboring large city appears. The share aged 65 and over rose from 22.6% in 2015 to 24.2% in 2020, but still stays in the lower half of the twenties — low for a regional city. The household-with-children share is 32.4% in 2020, conspicuously high for a regional city. The crude birth rate is 10.3 per thousand in 2020 — also high. The Childcare Waitlist was zero in both 2024 and 2025. The Fiscal Capacity Index was 0.63 in fiscal 2023 — a thick level for an ordinary regional city, able to cover a little over six-tenths of expenditure with its own tax revenue. The figure shows in the numbers: a farming plateau gathering young households and increasing its population after the merger. Why it takes this form cannot be read without going back to the past of the plateau, the farming and the neighboring large city.
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 neighboring large city, the farming plateau, a castle site and factories, the merger of two towns — the history behind the numbers
What supports Koshi’s past is the position of a plateau adjoining a large city, the farming plateau where watermelons ripen, a castle site and factories, and the merger of two towns. The oldest layer is the farming plateau. This land spreads over a gentle plateau, and on the plateau watermelons have ripened and the scenery of fields and pasture has spread. In old times, it is told that a warrior who became the steward of this land around the Kamakura era built a castle. The farming plateau is the foundation of this land.
This farming plateau opened, in modern times, as a place to live. This land adjoins a large city to the north, and a private railway links the two. In time, young households commuting to the neighboring large city came to live one after another on the farming plateau. Factories making motorcycle parts and factories handling tobacco materials, too, advanced onto the plateau. The path to becoming a city, too, mirrors this town. In 2006 the two towns lined up on the plateau were bound anew into one, and the present city was established. The position of the neighboring large city, the farming plateau, the castle site and factories, and the merger of two towns — the land that piled these four layers is the present Koshi.
Source: Koshi City / the suburbs of Kumamoto (a bedtown adjoining Kumamoto City to the north with a population on the rise; residential areas spread along the Kumamoto Dentetsu line; the north has watermelon and other field crops and stock-raising — overview) / Koshi City / the Takaba Castle (the Takaba Castle, said to have been built by Nakahara Morokazu, appointed steward of Koshi County in the Kenkyu era [1190–1198] — overview) / Koshi City (established on 2006-2-27 by the new merger of Koshi Town and Nishigoshi Town of Kikuchi County; total population at establishment about 54,000 — overview)
03 · In a farming plateau adjoining a large city to the north, increasing population after the merger
What characterizes Koshi is that, while it holds the past of a farming plateau adjoining a large city to the north, it is increasing its population after the merger. From the 55,002 of 2010, seen in the city area after the merger, to the 61,772 of 2020, some seven thousand were gained over ten years. Behind this town having increased, amid many regional cities losing population, one can read the position of being able to commute by private railway to the neighboring large city, and the land easy to open up that spreads over the plateau. That the household-with-children share is conspicuously high at 32.4% in 2020, that the crude birth rate is high at 10.3 per thousand, and that the share aged 65 and over still stays in the lower half of the twenties, are expressions of that.
On the other hand, the Childcare Waitlist was zero in both 2024 and 2025, and one can read that, though a farming plateau, the place of childcare has received the inflow of young households. The Fiscal Capacity Index of 0.63 is a level able to cover a little over six-tenths of expenditure with its own tax revenue, thick for an ordinary regional city, helped also by the tax source of the factories that advanced onto the plateau. The population increased after the merger, the households with children are conspicuously many, and the age is, for a regional city, young. The figure of a plateau city facing the opposite way from many regional cities forms an image only thus, with population, age and finances laid out on a single sheet.
Source: Population Census (Statistics Bureau, MIC) / Local Government Finance Survey, Fiscal Capacity Index (MIC) / Childcare Facility Status Report (Children and Families Agency)
04 · A plateau adjoining a large city held both farming and young households
The functions Koshi holds are not one. There is the past of the neighboring large city, adjoining a large city to the north, with a private railway linking the two. There is also the character of a farming plateau, ripening watermelons on the gentle plateau and leaving the scenery of fields and pasture. And it holds the face of a land of young households and factories, gathering young households commuting to the neighboring large city and holding factories on the plateau. The landform of a plateau adjoining a large city brought both the scenery of farming and the place for young households to live to the same single land.
Koshi is a town where a plateau adjoining a large city held both farming and young households. From the position of the neighboring large city, to the farming plateau, the castle site and factories, and the merger of two towns, what set the skeleton was the geography of "a gentle plateau adjoining a large city to the north." Amid many regional cities turning to the sending-out side of people, this plateau takes on the young households commuting to the neighboring city and keeps increasing people. The three faces of farming, factories and housing dwell together on the same plateau.
Source: Koshi City / the suburbs of Kumamoto (a bedtown adjoining Kumamoto City to the north with a population on the rise; residential areas spread along the Kumamoto Dentetsu line; the north has watermelon and other field crops and stock-raising — overview) / Koshi City / the Takaba Castle (the Takaba Castle, said to have been built by Nakahara Morokazu, appointed steward of Koshi County in the Kenkyu era [1190–1198] — overview) / Koshi City (established on 2006-2-27 by the new merger of Koshi Town and Nishigoshi Town of Kikuchi County; total population at establishment about 54,000 — overview)
05 · Atlas’s note — in a farming plateau adjoining a large city to the north, farming, factories and housing overlap
Lay out Koshi’s numbers and the indicators of a plateau city gathering young households line up: a population increasing after the merger, an aging rate of 24.2%, a household-with-children share of 32.4%, a crude birth rate of 10.3, and a fiscal capacity of 0.63. But when I (Atlas), as a certified public accountant, read these, what I want to read here is the overlap of farming and housing — that this town, "though a plateau leaving the scenery of farming, gathers young households commuting to the neighboring large city, and its household-with-children share is conspicuously high for a regional city." The face of a farming plateau where watermelons ripen, and the face of a place to live for young households commuting to the neighboring city, overlap on the same single plateau. The chain by which being a farming plateau, rather, gave rise to residential land easy to open up and drew in young households explains this town’s numbers well.
Another thing I want to consider is that this town’s Fiscal Capacity Index of 0.63 — a thick level for an ordinary regional city — is supported by the tax source of the factories that advanced onto the farming plateau and by the inflow of young households. While leaving the scenery of farming, it holds the tax sources of factories and young households.
The three faces of the scenery of farming, the factories that advanced onto the plateau, and the inflowing young households overlap on the same single plateau, and support finances thick for a regional city. Whether to view this town as a place of residence for young households adjoining Kumamoto City, or as a plateau where farming still continues, changes with where in living one turns one’s eyes. The three faces of the scenery of farming, the factories that advanced onto the plateau, and the inflowing young households overlap on the same single plateau, and support finances thick for a regional city.
Source: Population Census (Statistics Bureau, MIC) / Koshi City / the suburbs of Kumamoto (a bedtown adjoining Kumamoto City to the north with a population on the rise; residential areas spread along the Kumamoto Dentetsu line; the north has watermelon and other field crops and stock-raising — overview) / Koshi City / the Takaba Castle (the Takaba Castle, said to have been built by Nakahara Morokazu, appointed steward of Koshi County in the Kenkyu era [1190–1198] — overview) / Koshi City (established on 2006-2-27 by the new merger of Koshi Town and Nishigoshi Town of Kikuchi County; total population at establishment about 54,000 — 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 (wave33-west 2026-06-04)) handled the shaping of the text. Evaluative or predictive language (such as “a good buy” or “attractive”) is intentionally left out. Revision id: wave33w_