18 facilities · 17 cities
Uptime Institute Tier III data centers in United States
Facilities in United States that publish Tier III certification. Concurrently maintainable design: any capacity component can be taken out for service without shutting down IT load. The practical floor for production workloads.
18 of the 574 facilities we track in United States publish Tier III — 8 operators, 326 MW of published IT capacity, 18 operational. Cities: Quincy, WA, Phoenix, Manassas, Chandler, Elk Grove Village, Irvine, Myrtle Beach, Columbus, Denver, Huntsville, Birmingham, Greenville, Miamisburg, Chattanooga, Clifton, Franklin, Allen.
For context, wholesale colocation in United States is benchmarked at $196 per kW per month (CBRE, North America Data Center Trends H2 2025), and commercial electricity at $0.109 per kWh — certification rarely changes the rack rate, but it narrows the shortlist.
| Facility | Operator | City | MW | Status |
|---|---|---|---|---|
| Vantage Quincy Campus | Vantage Data Centers | Quincy, WA | 89 | Operational |
| Iron Mountain AZP-1 | Iron Mountain | Phoenix | 41 | Operational |
| Iron Mountain VA-2 | Iron Mountain | Manassas | 36 | Operational |
| H5 Data Centers Phoenix | H5 Data Centers | Chandler | 26 | Operational |
| Csquare ORD2 | Csquare | Elk Grove Village | 25.9 | Operational |
| Csquare LAX3 | Csquare | Irvine | 24.9 | Operational |
| DC BLOX Myrtle Beach Cable Landing Station | DC BLOX | Myrtle Beach | 19 | Operational |
| Cologix COL3 | Cologix | Columbus | 18 | Operational |
| Iron Mountain DEN-1 | Iron Mountain | Denver | 14.4 | Operational |
| Iron Mountain VA-1 | Iron Mountain | Manassas | 12.4 | Operational |
| DC BLOX Huntsville (HSV1) | DC BLOX | Huntsville | 9 | Operational |
| DC BLOX Birmingham (BHM1) | DC BLOX | Birmingham | 5 | Operational |
| DC BLOX Greenville (GSP1) | DC BLOX | Greenville | 3 | Operational |
| Iron Mountain OHS-1 | Iron Mountain | Miamisburg | 1.4 | Operational |
| DC BLOX Chattanooga (CHA1) | DC BLOX | Chattanooga | 1 | Operational |
| EWR21 | Digital Realty | Clifton | — | Operational |
| TierPoint Nashville | TierPoint | Franklin | — | Operational |
| TierPoint Dallas (Allen) | TierPoint | Allen | — | Operational |
Comparing Tier III facilities in United States?
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See also: all data centers in United States · Uptime Institute Tier III worldwide · colocation pricing