Japan Data Center Map: Almost Everything Sits in Just a Dozen Locations

A data center is not a box you can drop anywhere. It only gets built where ground conditions, power, connectivity and disaster risk line up. We tell the story of Japan's single biggest cluster in why Inzai in Chiba became Japan's data center capital (in Japanese); this article takes the bird's-eye view — a national map plus a detailed cluster table.

Where are Japan's data centers?

Japan's data centers sit in two great clusters: Greater Tokyo (Chiba and Tokyo) and Kansai (Osaka, Kyoto, Nara). By power capacity, roughly 90% is concentrated in these Tokyo and Osaka areas (JLL), with the remainder in dispersed hubs in Hokkaido, Kyushu and elsewhere. The specific locations narrow down to about a dozen:

• Inzai City, Chiba: Japan's largest cluster, nicknamed the "data center Ginza," home to Google, NTT, AWS and others
• Akishima City, Tokyo (Tama area): a suburban hub where GLP Japan is developing a large campus including eight data center buildings
• Central Tokyo (Otemachi/Shinagawa): the network junction where Japan's IX (Internet Exchange) points concentrate
• Ibaraki/Minoh in Osaka (Saito) and the Keihanna Science City / Ikoma in Nara: Kansai's second pole
• Sakai City, Osaka: a new AI-focused hub built on the site of a former Sharp factory
• Ishikari and Tomakomai, Hokkaido: dispersal hubs leveraging a cool climate and renewable energy
• Kitakyushu and Itoshima, Fukuoka: Kyushu's dispersal hubs, built on inexpensive electricity
• Akita City (Iijima district), Akita Prefecture: a proposed AI data center of up to 500 MW (megawatts, a unit of power capacity) — still at the planning stage

The locations are this limited because few sites simultaneously offer abundant power, firm ground, low disaster risk and fast connectivity. In other words, data center locations are not arbitrary — they gravitate inevitably to the land that meets the conditions. In recent years, power has become harder to secure in the Tokyo area, and with government subsidies, locations have begun spreading to Hokkaido and Kyushu (MIC / METI). The map and table below walk through each location and its rationale.

Where in Japan do data centers cluster?

Measured by power capacity, about 90% of Japan's data centers concentrate in just two areas — Greater Tokyo and Greater Osaka. And within each area, they cluster further into specific cities and districts. The map below shows the country's major clusters. Click a site to see its siting rationale and major operators.

Organized by cluster, the national picture looks like this — region, flagship locations, siting rationale and major operators in one table.

Why is the distribution so lopsided? Because the required conditions — abundant power, firm ground, low disaster risk, fast (low-latency) connectivity, proximity to interconnection points — coincide in only a handful of places. Let's look at each cluster in turn.

Why do data centers concentrate in Inzai and Greater Tokyo?

The biggest reason for the Tokyo-area concentration is that power, ground conditions and low latency all line up at once. The centerpiece is Inzai City in Chiba, Japan's largest cluster, sometimes called the "data center Ginza." Concretely, Inzai sits on the Shimosa Plateau — old, firmly compacted terrain — making it resilient to earthquake shaking and liquefaction (where the ground turns fluid). It also lies on high ground roughly 35 km inland with no major rivers nearby, so tsunami and flood risk is low.

On top of that, major financial institutions historically located their large computing centers there, so extra-high-voltage power infrastructure (the equipment needed to receive very large electricity supplies) was already in place. Google, a hyperscaler, opened its first data center in Japan in Inzai in 2023 (Google).

Greater Tokyo also has a different type of cluster. One is the suburban model exemplified by Akishima, where GLP Japan is developing roughly 58.8 hectares including eight data center buildings. The appeal: land parcels far larger than anything available in central Tokyo, while still keeping low latency to the capital region (GLP Japan) (JLL).

Where is the interconnection hub?

The interconnection hub is central Tokyo — Otemachi and Shinagawa. Why put data centers on some of Japan's most expensive land? Because this is where the IX points (Internet Exchanges — the facilities where network operators plug directly into one another) concentrate. Ever since Japan's first commercial IX, JPIX, was established in Otemachi in 1997, the country's major IXs and carriers have clustered there.

The strength of these central-Tokyo facilities is direct, low-latency interconnection with many operators inside a single building. That makes the location extremely valuable for latency-critical financial trading and for distributing content to large user bases. If Inzai and Akishima are "where you put capacity," Otemachi and Shinagawa are "where the wires come together" (JPNIC).

Where is Kansai's second pole?

Kansai's second pole comprises central Osaka plus Saito (straddling Ibaraki and Minoh in Osaka Prefecture) and the Keihanna Science City (the Kansai research corridor spanning Kyoto, Osaka and Nara — Ikoma in Nara belongs to this zone). The single biggest reason Kansai matters is east–west separation.

Osaka sits about 400 km from Tokyo, on different seismic zones and a different utility grid. That makes it the natural backup site (DR/BCP — the arrangements that keep businesses running through a disaster) if the capital region is hit by a major catastrophe. Osaka is also Japan's second-largest economy, close to users across western Japan. JLL projects the Osaka-area market to expand more than 380% from end-2024 levels after 2025, rapidly raising its profile as the second pole (JLL).

What's new in Sakai and Akita?

In Sakai City, Osaka, an AI-focused data center cluster is emerging on the site of a former Sharp factory. KDDI began offering its "Osaka Sakai Data Center" in January 2026, running it as an AI-oriented site equipped with high-performance chips (GPUs) built for AI workloads. On an adjoining parcel, SoftBank has also acquired land and plans to expand power capacity in stages from roughly 150 MW to more than 250 MW. The advantage is that the factory site's large existing power infrastructure can be reused directly.

Separately, in the Iijima district of Akita City, a large AI data center plan of up to 500 MW and a construction cost of more than ¥2 trillion has been reported. The preparatory committee includes S2 and Bitgrit, and a sovereign wealth fund from the UAE (United Arab Emirates) is reportedly considering an investment, though this has not been confirmed. The target for start of operations is reportedly the early 2030s, but as of now this remains a proposal at the planning stage — no primary-source confirmation of groundbreaking or committed funding exists yet. We cover the plan in more detail in the UAE fund's proposed Akita AI data center.

Why is the dispersal to Hokkaido and Kyushu accelerating?

The biggest driver of the dispersal to Hokkaido and Kyushu is that power has become hard to secure in Greater Tokyo. Behind this lies grid congestion — projects queuing for grid connections because transmission capacity has run out. We cover this in detail in why data centers cannot get built despite available electricity (in Japanese).

In response, Japan's Ministry of Economy, Trade and Industry (METI) has set a policy of building third and fourth core hubs in Hokkaido and Kyushu to complement the Tokyo and Osaka areas, subsidizing up to half of construction costs there. In Hokkaido, SoftBank is building an AI data center in Tomakomai, with METI providing up to roughly 30 billion yen in subsidies (MIC / METI).

In Ishikari, Sakura Internet already operates a data center cooled by the cold outside air — free-air cooling that cuts power consumption by roughly 40% versus urban facilities. The company plans to complete a renewable-powered data center in Ishikari with 15 MW (megawatts) of total power capacity in Q1 2026 (Nikkei) (Nikkei).

In Kyushu, meanwhile, inexpensive electricity and a high share of carbon-free generation have made Kitakyushu and Itoshima the region's new anchors. Concretely, the Kitakyushu Science and Research Park hosts a plan totaling 120 MW (initial phase 60 MW), and Itoshima City in Fukuoka a plan totaling 300 MW. Cool climates, renewable energy and available grid capacity are redrawing Japan's data center map — from a Tokyo–Osaka duopoly toward genuine regional dispersal (JLL).

Key takeaways

• Roughly 90% of Japan's data center power capacity is concentrated in Greater Tokyo and Greater Osaka (JLL).
• The Tokyo-area cores are Inzai (hard ground, extra-high-voltage power, low disaster risk), Akishima (large land parcels), and Otemachi/Shinagawa (IX hubs).
• Kansai's second pole — Saito, Keihanna and Ikoma — provides east–west disaster-recovery separation about 400 km from Tokyo.
• Sakai, Osaka is a newly active AI-focused hub (KDDI, SoftBank) built on a former factory site; Akita's proposed 500 MW AI data center remains at the planning stage, with funding unconfirmed.
• Power constraints and government policy are driving dispersal to Hokkaido (Ishikari, Tomakomai) and Kyushu (Kitakyushu, Itoshima).
• Grid-connection queues, renewables and cool climates are the siting logic behind the regional shift.

This article is not investment advice.