Chuo-ku

In the most recent Population Census the population is about 169,000 (169,179 in 2020). Over the mere five years from 141,183 in 2015 it added some twenty-eight thousand. For a central ward, that is an unusual gain.

What is worth seeing here is that it is not only adults who increased. Those under 15 rose from 16,798 (2015) to 23,086 (2020), some six thousand more in five years. Over the same period the share aged 65 and over fell from 16.1% to 14.6%. Households with children make up 18.6% (2020). While in much of urban Japan the aging rate climbs and children thin, Chuo-ku is one of the few wards where both point the other way. The residential land price is in the 1.7-million-yen-per-m² range. The Fiscal Capacity Index is 0.61, but because the special wards have much of their tax base pooled at the metropolitan level and redistributed through the Tokyo Metropolitan–Ward Financial Adjustment System, this figure does not directly express the ward’s self-sufficiency. The childcare waitlist has been pressed down to 0 children (2025) — supply catching up with the surging number of children. That the markers of rejuvenation line up this fully in a central ward becomes legible only by tracing the swing of that pendulum: ground made by filling the sea hollowed out its commercial core, and waterfront redevelopment then drew housing back.

Chuo-ku’s skeleton is made of two origins: land created by filling the sea, and the commercial center set upon it. Around 1590, when Tokugawa Ieyasu entered Edo, most of what is now Chuo-ku was tidal reed shore. With the opening of the Edo shogunate the laying-out of blocks began, and the low ground of Suzaki was filled with earth cut from Kanda Hill. It is a textbook case, in the terms of economic geography, of a city set not on natural land but on ground raised by human hands.

On that filled land, Nihonbashi was placed as the starting point of the five highways, and towns such as Ginza, Kyobashi and Tsukiji lined up to form Edo’s largest commercial core. In 1947 the former Nihonbashi Ward and Kyobashi Ward merged to form Chuo Ward. Its character as a commercial district held, and from the high-growth era through the years after the bubble’s collapse, housing was replaced by office buildings one after another — the so-called doughnut effect. Crowded by day, empty by night: the population kept falling, dropping to an all-time low of about 72,000 in 1997. The origin of being a commercial core itself once hollowed out Chuo-ku as a place to live. Here lies the thread: a commercial center built by filling the reed shore lost its people because of that very commerce.

What characterizes Chuo-ku is that a population once drawn down into the seventy-thousands has been rapidly refilled since the turn of the century. That appears in the figures for living infrastructure in a form opposite to the consolidations common in regional cities that lost large populations. Into a center hollowed out as offices replaced homes, housing this time came back. High-rise residences rose in clusters on the reclaimed waterfront — Tsukishima, Tsukuda, Kachidoki, Harumi — and young households moved in.

The result is a figure rare in central Tokyo: those under 15 up six thousand in five years, and the aging rate actually falling. The childcare waitlist has been pressed down to 0. But this is not a “zero from a thinned number of children”; it is a zero reached by keeping supply abreast of a surging number of children. Read the same “zero waitlist,” and its meaning flips entirely with whether the children behind it are rising or thinning. Children increase, childcare chases them, the aging rate falls — Chuo-ku’s numbers read straight as the consequence of housing and young households returning to a vacated center. Pull out a single figure, and the whole of this swing-back stays out of view.

Chuo-ku holds several functions of its own. One is the commercial core centered on Nihonbashi, the starting point of the five highways, which together with Ginza and Kyobashi has kept its commercial character since Edo. The other is the waterfront, reclaimed in succession from the Meiji era on. Tsukishima was raised in 1892 as the first plot of the Tokyo Bay reclamation, Kachidoki as the second and third plots from Meiji into Taisho, and Harumi as the fourth plot in the Showa era. This waterfront, which has held the fishing town of Tsukuda since Edo, is now a residential district of clustered high-rises.

Chuo-ku filled the reed shore to make a commercial core, lost its people because of that commerce, then reclaimed the waterfront anew to bring people back with housing. Reclamation, commerce, hollowing-out, re-reclamation — these origins have set different functions onto the same ground, era by era. The commercial district and the reclaimed land alike rest, in the end, on the same condition: ground made by filling the sea. Natural land did not carry the town. Land made by filling the sea summoned commerce, then a hollowing-out, then housing, in turn. The raised ground itself is the agent that has driven this ward’s pendulum.