Why St. Louis is a market
St. Louis is an interconnection market that does not get discussed as one. Nine listed buildings carry one hundred and three network presences and eleven internet exchange presences between them, which is more than Cleveland, more than Wisconsin, and more than any market this ramp has published. For a metro this size that is unusual, and it is the whole reason the page exists.
The reason is geography and history. St. Louis sits where long haul fibre routes between Chicago, Dallas, Kansas City and the Southeast cross, and two large downtown buildings became the places where that crossing happens. Carrier hotels are sticky in a way that new construction is not: once most of a region's networks are in a building, the cheapest place for the next network to be is that same building.
It is also TierPoint's home town. The company is headquartered here and runs four buildings in the metro, which means the operator you are most likely to deal with has more to lose from a bad local reputation than a national landlord would.
What St. Louis is not is a construction market, and the page does not pretend otherwise. There is no permit section below at all, for reasons worth reading.
Why this page has no construction pipeline section
Every other market guide on this site carries a block counting the data center permits we have collected in it. This one does not, and that is a finding rather than an omission.
We run a statewide Missouri permit collector. It reads the federal air facility register for the whole state and returns nine data center sites, and every one of them is in the Kansas City metro or at the Walmart campus at Pineville in the far southwest corner. Not one is in St. Louis. We hold no city or county building permit source here either. So rather than publish a zero, which would read as "nothing is being built" when it means "we do not collect here", the section is absent and this paragraph explains why.
The practical consequence for a buyer is simple. On this page, the interconnection table is the evidence, and the announced table is a plan. Neither is a filing you can check at a county office, which is exactly the standard the rest of the site holds itself to and cannot meet here.
Two do and two do not. The interconnection layer is the strongest thing on this page by a wide margin, drawn from PeeringDB, which the network operators maintain themselves, so every row links to the building's own public entry. The announced layer is here, collected by hand, and is one project. The permit layer is absent for the reason set out above: our Missouri collector covers the state and finds nothing in this metro. Our verified facility inventory does not extend here either. See how we verify capacity for what each collection proves and what its absence means.
Who is actually plugged in across St. Louis
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.
| Measure | Figure | What it means |
|---|---|---|
| Buildings listed | 9 | Registered in PeeringDB across St. Louis, by 5 operators |
| Buildings with a network present | 9 | Every listed building has at least one network in it |
| Network presences | 103 | Counted per building, so a carrier in three buildings counts three times |
| Internet exchange presences | 11 | Where you can reach many networks through one port instead of many cross-connects |
| Carrier presences | 7 | The physical transport choice you can buy without leaving the building |
| In the densest building | 43% | Netrality St. Louis - 900 Walnut holds 44 of the market's network presences |
The most connected buildings here
| Networks | Building | Operator | Exchanges | Carriers |
|---|---|---|---|---|
| 44 | Netrality St. Louis - 900 Walnut | Netrality Data Centers | 4 | 2 |
| 41 | Netrality St. Louis - 210 N Tucker | Netrality Data Centers | 4 | 3 |
| 4 | 710 Tucker St Louis | Hostirian | 0 | 0 |
| 3 | Cogent St Louis | Cogent Communications, Inc. | 1 | 0 |
| 3 | H5 Data Centers St. Louis (MO01) | H5 Data Centers | 1 | 1 |
| 3 | TierPoint St. Louis - Walnut | TierPoint, LLC | 1 | 0 |
| 2 | TierPoint St. Louis - Olive | TierPoint, LLC | 0 | 1 |
| 2 | TierPoint St. Louis – Millpark | TierPoint, LLC | 0 | 0 |
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 St. Louis
Announcements are not filings. Nobody has to build what they announce, the figure is the one the developer chose to publish, and the date moves. They are here because megawatts are what a requirement is measured in, and because the size of what is coming changes who will take your call. Every figure below links to a published report that states it, and was checked against at least one other independent report before it was written down.
| Capacity | Operator | Project | What was announced |
|---|---|---|---|
| 120 MW | TerraWatt, with Contour and Steadfast City | Armory Innovation District, the former Famous-Barr warehouse at 3728 Market Street | A 120 MW facility in the Macy's and Famous-Barr warehouse next to the historic Armory in Midtown, which is itself being converted to office space as part of the same technology hub plan. The city's Land Clearance for Redevelopment Authority gave final approval to the community benefit plan on 15 September 2026, two days before this page was written. Cost is reported two ways and the row does not pick between them: about $3 billion in most reporting and $3.1 billion in some, split as roughly $1 billion to construct and $2 billion to fit out with equipment. The schedule is the part a buyer should hold onto: construction is stated to begin in August 2027 and complete in late 2029, so this is not supply for anything before the end of the decade. The agreement carries commitments a reader should know about, including closed loop cooling, a $15.7 million payment to the city and a requirement that at least half the facility's energy come from renewable sources within five years. Stated capacity of the planned facility, approved rather than built |
One announced project, approved two days before this page was written, and it does not change what St. Louis is today. The 120 MW at the Armory is a 2029 delivery on the developer's own schedule, and the city spent most of 2026 arguing about the rules such a building would be held to, with regulations restricting large data centers to industrial areas reaching the mayor in September. Treat it as a signal that the city wants this industry rather than as capacity you can plan against. The market a buyer can reach now is the nine interconnected buildings below, and they are a different proposition entirely: two carrier hotels that most of the region's traffic already passes through, and a hometown operator with four buildings. One more boundary worth stating, because the headline numbers nearby are large and do not belong to this page. Amazon has announced a reported $10 billion campus in Montgomery County, Missouri, which is roughly sixty miles west of the city and is not counted anywhere on this site. It is not St. Louis inventory and a buyer should not treat it as such. Read the reporting.
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.
Buying power here, and the rules that are still being written
St. Louis is Ameren Missouri territory. The relevant development is that Ameren has introduced a rate structure for very large electricity users, and the threshold matters to how the market will develop: the 120 MW project approved in Midtown is large enough to fall under it. For a colocation buyer taking space in an existing building none of that applies directly, but it shapes what your operator pays and therefore what you will be quoted at renewal.
The zoning position is also unsettled in a way worth knowing. Through 2026 the city worked on regulations restricting large data centers to industrial areas, and those rules reached the mayor in September, in the same month the Midtown project received its final community benefit approval. A market writing its rules and approving its largest project in the same fortnight is a market in motion, and terms agreed now may not resemble terms available in two years.
Ask how many of the networks you need are in the specific building, not in the metro. Concentration here is extreme: two buildings hold more than eighty percent of the region's registered network presences, so the difference between being in one of them and being ten minutes away is the difference between a cross connect and a local loop. Then ask what a cross connect costs and what it will cost at renewal, because in a carrier hotel that recurring charge, not the rack, is usually the number that grows.
Where the market actually is
900 Walnut
The densest building in the market, forty four networks and four exchange presences, operated by Netrality. If your requirement is network led, this is the default answer and the burden of proof is on any alternative.
210 North Tucker
The other Netrality carrier hotel, forty one networks and four exchange presences, a few blocks away. Between them these two buildings hold eighty five of the market's one hundred and three network presences. The useful thing about having two rather than one is that a genuine second site inside the same metro is possible without leaving the interconnection core.
TierPoint's four buildings
Walnut, Olive and Locust downtown, and Millpark out at Maryland Heights. Lower network counts, and a different proposition: managed and enterprise colocation from a local headquarters rather than a carrier hotel floor. Millpark is the one to look at if you want to be out of downtown.
Midtown and the Armory
Where the one large project is going, in the old Famous-Barr warehouse beside the Armory on Market Street. Approved in September 2026, construction stated to start in August 2027, completion late 2029. Relevant to a 2029 requirement and to nothing sooner.
When St. Louis is right, and when it is the wrong choice
It is right when interconnection is the requirement and Chicago is more than you need. One hundred and three network presences and eleven exchange presences in a metro this size means you can reach most of what you need without paying Chicago prices or Chicago cross connect fees, and the two carrier hotels give you a credible in-metro second site. It is also a sound central second location for an organisation already in Chicago, Dallas or Atlanta.
It is the wrong choice if you need a large new hall on a near term date. There is one project of that shape, it was approved days ago, and it does not complete until late 2029. Nothing else here has a published megawatt figure. A requirement needing tens of megawatts before 2029 should be tested against Chicago and Kansas City.
It is also the wrong choice if you need to be out of a downtown core for risk reasons and still want the interconnection. The density here is concentrated in two adjacent downtown buildings, and the suburban option, Millpark, is a different kind of building with a fraction of the network count.
Because this is a carrier hotel market, negotiate the cross connects as hard as the space, and get renewal pricing for them written down at the start. Ask which of the two Netrality buildings your networks are actually in, since being in the wrong one costs you a metro loop. Ask for committed and energised capacity separately from design capacity, and in the older downtown stock ask about floor loading and what the building can sustain per rack. Ask your operator what Ameren's large load rate structure does to their cost base and whether it can be passed through to you. And if anyone offers the Armory project as available capacity, ask them for its energisation date.