Tagajo-shi

In the latest Population Census the population is about sixty-three thousand (62,827 in 2020). Its movement is nearly level. From 61,457 in 2000, through 62,745 in 2005, 63,060 in 2010, and 62,096 in 2015, to 62,827 in 2020, it has held in the sixty-two-thousand range.

Look inside and the shape of a residential town grown on the outskirts of a great city appears. The share aged 65 and over rose from 12.4% in 2000 to 24.7% in 2020, roughly doubling over twenty years; but among the many regional cities nearing four-tenths, it stays in the middle of the twenties. The share of households with children was 22.6% in 2020, on the high side, and the Childcare Waitlist, which stood at one in 2024, became zero in 2025. The Fiscal Capacity Index was 0.69 in fiscal 2023 — able to cover nearly seven-tenths of expenditure with its own tax revenue, a level on the higher side of the middle for a small-to-medium city. The numbers show the ground of the ancient office holding its population nearly level while keeping a comparative youth as a suburban residential town. Why this shape — that cannot be read without tracing back the history of the provincial seat and of suburbanization.

This town’s frame is set by an ancient office placed about thirteen hundred years ago, and by the modern flow that later folded it into the outskirts of a great city. The old layer is the office. In 724, a provincial seat to rule the province of Mutsu was placed on this ground. On a hill that looks over the Sendai plain, a section roughly one kilometer on a side was enclosed by a wall, and at its center stood a government hall where important affairs and ceremonies were held. Together with the provincial seat that governed administration, this office also held the Pacification Headquarters that bore the defense of Tohoku, and from the Nara era into the middle of the Heian era this ground continued to be the political, military, and cultural center of all Tohoku. For the state of the time, alongside the key point guarding the west, this office was the key point guarding the east. The trace of that office was later designated a Special Historic Site of the country, and remains on this ground even now.

Then, in the modern era, this town changed its character. The ground of the ancient office, in the modern era, took advantage of its location next to a great city and turned into a place where people live. Railways and roads connecting it to the neighboring great city ran through, residential land spread from the lowland up onto the hills, and it grew into a residential town convenient for commuting. In 1971, the town became a city. The ancient office that guarded the east was placed here, and that same hill came in time to be covered by commuters’ dwellings — these two layers of differing character, the provincial seat and suburbanization, are piled on one hill that looks over the Sendai plain.

What sets Tagajo apart is that, while it holds the history of the ancient office, it has held its population nearly level and keeps a comparative youth as a suburban residential town. From 61,457 in 2000 to 62,827 in 2020, it has even risen slightly over twenty years. Its location in the commuting range of the neighboring great city can be read as having given this town the character of a dwelling convenient for commuting, and as having held its population without greatly breaking it. That the share aged 65 and over stays in the middle of the twenties at 24.7% in 2020, and that the household-with-children share is on the high side at 22.6%, are expressions of young households continuing to flow in to commute to the great city.

On the other hand, the Childcare Waitlist, which stood at one in 2024, became zero in 2025. It can be read that, against the inflowing households with children, the capacity for childcare has roughly kept pace. The Fiscal Capacity Index of 0.69 is a level able to cover nearly seven-tenths of expenditure with its own tax revenue, on the higher side of the middle for a small-to-medium city. The incomes of residents who commute to the great city can be read as giving thickness to the tax base. The ground of the ancient office now holds its population nearly level while keeping its youth as a suburban residential town. A nearly level population, aging in the middle of the twenties, and fiscal strength on the higher side of the middle — these three are not separate facts; they branch from one thread, that young households continuing to flow in to commute to the great city. Take out any one of them and read it alone, and you will mistake the image.

The layers Tagajo holds beneath its feet are not one. One is its history as the ground where, about thirteen hundred years ago, the Mutsu provincial seat and the Pacification Headquarters were placed, and which continued to be the center of all Tohoku from Nara into the middle of Heian — holding an old layer whose trace remains as a Special Historic Site of the country. Another is its position, where railways and roads connecting it to the neighboring great city run, holding the character of a suburban residential town folded into the commuting range of the great city. And its location, a hill that looks over the Sendai plain, was the foundation that called the ancient office and later spread residential land.

Tagajo is a town where the ground of the office that ruled ancient Tohoku became the outskirts of a great city. From the ancient office that ruled the whole of Tohoku to a residential town in the commuting range of a great city — the geography of "opening onto a hill that looks over the Sendai plain" first called the ancient office that guarded the east, and, across thirteen hundred years, this time called dwellings for commuting to a great city. The same hill, changing with the ages, has twice gathered people.