Nobody has proposed a data center in Philadelphia, and the city is writing the rules anyway.

Why Philadelphia is a market at all

Philadelphia is an interconnection and enterprise market, and it has never pretended to be anything else. It is the fifth largest US metro by population, it sits between two of the largest data center markets in the world, and it has almost no wholesale capacity of its own. The buildings that matter here are downtown carrier hotels and regional colocation sites serving Philadelphia businesses, universities and hospitals, not campuses serving hyperscalers.

That is not a failure of the market so much as a consequence of geography. Northern Virginia is two hundred miles south and New Jersey's Hudson waterfront is ninety miles north. A requirement large enough to be worth a campus has always been able to reach one of those instead, and the fibre between them is excellent. What stays here stays because the people using it are here.

The interconnection that does exist is heavily concentrated. One building on North Broad Street carries more than four in every ten network presences in the metro. If that building suits you this is a straightforward market. If it does not, the choices narrow fast.

Who is actually plugged in across Philadelphia

A building existing and a building being connected are different facts, and only one of them decides whether your traffic can get where it needs to go cheaply. These figures come from PeeringDB, which the network operators themselves maintain, so every row below links to the building's own public entry.

The most connected buildings here

From PeeringDB, which is maintained by the network operators present in these buildings rather than by the landlords, which is what makes it worth more than a directory. Two limits. Entries are voluntary, so a building showing no networks may be single tenant or may simply never have registered. And a network being present says nothing about whether the building has space, power or a price for you: that is still a call.

What has been announced in Philadelphia

Announced capacity is collected by hand from trade reporting and company statements, and each figure links to the report it came from. It is kept apart from the permit record above and never added to it: one is a document a jurisdiction issued, the other is a plan a company published. Neither is availability.

Announced capacity is collected by hand from trade reporting and company statements, and every figure links to the report it came from and was read in that report before it was written down. It is never added to the interconnection count above: one is a plan a company published, the other is a building a network registered itself into. Neither is availability.

The power fight is real, and it is not being fought over Philadelphia

Pennsylvania sits inside PJM, the largest grid operator in the country, and PJM told stakeholders in August 2025 that it is forecasting peak load growth of 32 gigawatts by 2030. Most of that growth is data centers, and the argument about who pays for it has become the defining energy politics of this state.

The sharpest version of that argument involves the local utility. PJM's independent market monitor asked federal regulators to reject a 23 September 2025 transmission service agreement between PECO and Amazon Data Services, on the grounds that it does not address the key question of whether there is sufficient capacity to serve, and recommended it not be approved unless PECO can demonstrate reliable and economical service. The Natural Resources Defense Council estimated PECO could face 9.1 billion dollars in costs by 2033. Whatever you think of either position, the practical consequence for a buyer is that connecting new large load in this territory is contested, slow and politically expensive.

Amazon's own commitment, at least twenty billion dollars across Pennsylvania and the largest private sector investment in the state's history, is going to Falls Township in Bucks County and Salem Township in Luzerne County. Falls Township is roughly thirty miles from Center City, which puts it in the Philadelphia metro for commuting purposes and outside it for almost every other purpose that matters to a colocation buyer: different municipality, different zoning, different politics and no retail colocation product.

What the city is preparing for

Philadelphia's Planning Commission has named the two sites in the city large enough to host a modern data center if one were ever proposed. The first is the Bellwether District at 3143 West Passyunk Avenue, the former South Philadelphia refinery, roughly 1,300 acres of mostly undeveloped land already zoned industrial. The second is 2600 Grant Avenue, a city owned property near the airport in the Northeast.

The commission's stated concern is employment density. Data centers employ about one worker per 5,000 square feet, which planners put at roughly 13 percent of the jobs a standard warehouse of the same size would carry, against up to 1,500 well paid union construction jobs during the build. That trade-off is the debate every jurisdiction in this region is now having, and Philadelphia is unusual only in having it before anyone has applied.

Where the market actually is, submarket by submarket

When this market is right, and when it is the wrong choice

Philadelphia is the right answer when your users, your staff or your regulators are in Philadelphia. For a regional enterprise, a hospital system, a university or a financial services firm that needs low latency to its own offices and a hands-on relationship with its provider, this is a perfectly good market with real carrier choice at 401 North Broad and competent operators around it.

It is also a sensible disaster recovery position for a New York or Northern Virginia primary. It is far enough from both to be independently exposed and close enough to either for synchronous replication to be a live conversation.

It is the wrong choice for anything at scale. There is no wholesale product here, no announced campus inside the city, and no published capacity figure for one. If your requirement is measured in megawatts rather than kilowatts, the honest answer is that you are shopping Northern Virginia, New Jersey or Bucks County, and a broker who answers a Philadelphia search with a Bucks County site should say so plainly rather than let the metro name do the work.