HELIOSOpen AI Infrastructure Observatory
Static snapshot. This site serves two different things: 1,853 data centres reported by OpenStreetMap contributors nationwide, and 13 sites Helios infers from Arizona parcel records, exported on July 29, 2026. The first is a map of what has been recorded; the second is an argued hypothesis with an evidence chain. This is a point-in-time export, not a live view. See meta.json or the methodology.

Prince William County

County in VA · 66 data centres recorded in OpenStreetMap

Mapped facilities
66
on the map today
Floor area
0.92
km² across 62 buildings
Share of US load
1,005
MW, inferred upper bound
Water
2.19
million gal/day, inferred
3 of these 66 are not mapped as buildings, so no power figure is estimated for them. 3 are campus boundaries covering 0.23 km² of land. The megawatt figure above divides a national total by building floor area, and the area of a land parcel is not floor area. A site still being built consumed none of the electricity that total measures. Both are counted here and left out of the estimate rather than folded into it, so this region's load is understated by however much those represent.

When these appeared on the map

observed, not surveyed
03467201620182019202020212023202420252026
Data centres recorded in OpenStreetMap at the end of each month. The hatched stretch is before 2017-01, when telecom=data_center was not yet in common use — the near-zero readings there describe the tag, not the country. This is a count of what has been mapped, and OpenStreetMap carries no construction dates.

What the grid here looks like

reported by OSM contributors
Substations
59
69 kV and above
Bulk substations
33
230 kV and above
Highest voltage
500
kV, present in this county
Generating capacity
726
MW across 4 plants

A facility drawing hundreds of megawatts connects at bulk transmission voltage, so the second figure matters more than the first: forty 69 kV yards are not a substitute for one 500 kV substation.

Proximity is not connection. Nothing here shows that any facility has contracted power from any of these substations. That gets settled in interconnection filings Helios cannot read, and in several regions those queues now run for years. A county showing no substations may have none mapped rather than none standing.

Largest named mapped records

by mapped area
NameOperatorMapped asMapped area m²Share MWFirst mapped
CloudHQ MCC1CloudHQBuilding37,15340.72021-10-27
CloudHQ MCC2CloudHQBuilding32,61835.82021-10-27
GoogleGoogleBuilding26,91729.52024-02-19
GoogleGoogleBuilding26,90729.52024-05-28
GoogleGoogleBuilding26,90429.52026-01-05
VA 4Digital RealtyBuilding24,48426.82021-08-03
Microsoft Data Center 2MicrosoftBuilding22,95425.22025-11-03
Amazon IAD-55Amazon Web ServicesBuilding21,19523.22021-09-14
Equinix DC14EquinixCampus boundary20,703—2023-11-29
Amazon Web ServicesAmazon Web ServicesBuilding19,95121.92021-10-26
Amazon Web ServicesAmazon Web ServicesBuilding19,94321.92021-10-26
Amazon IAD100Amazon Web ServicesBuilding19,93821.92021-10-27
Amazon IAD102Amazon Web ServicesBuilding19,91321.82021-10-27
Amazon IAD101Amazon Web ServicesBuilding19,91221.82021-10-27
AWS IAD105Amazon Web ServicesBuilding19,90621.82023-01-24
AWS IAD104Amazon Web ServicesBuilding19,90521.82023-01-24
Amazon Web ServicesAmazon Web ServicesBuilding19,76121.72024-02-19
AWS IAD106Amazon Web ServicesBuilding19,06420.92023-11-07
Iron Mountain VA-6Iron MountainBuilding16,90118.52024-12-22
Iron Mountain VA-3Iron MountainBuilding16,83218.42024-05-16
Iron Mountain VA-1Iron MountainBuilding15,21716.72021-10-26
Iron Mountain VA-2Iron MountainBuilding14,74016.22021-10-26
QTS Manassas DC5Quality Technology ServicesBuilding14,26415.62023-06-27
Amazon IAD84Amazon Web ServicesBuilding14,18615.62020-07-20
Amazon Web ServicesAmazon Web ServicesBuilding13,87315.22024-05-06
COPT Innovation Park Data CenterAmazon Web ServicesBuilding13,86215.22023-06-12
Amazon Web ServicesAmazon Web ServicesBuilding13,84915.22021-10-26
Amazon Web ServicesAmazon Web ServicesBuilding13,84915.22021-10-26
Amazon IAD64Amazon Web ServicesBuilding13,70815.02020-07-20
Amazon IAD74Amazon Web ServicesBuilding13,70115.02021-10-26
Amazon IAD73Amazon Web ServicesBuilding13,57914.92021-10-26
Amazon IAD103Amazon Web ServicesBuilding13,18414.42023-11-29
QTS Manassas DC2Quality Technology ServicesBuilding12,81814.12024-05-28
Amazon Web ServicesAmazon Web ServicesBuilding12,55913.82026-05-08
Amazon Web ServicesAmazon Web ServicesBuilding12,44613.62026-05-08
Amazon Web ServicesAmazon Web ServicesBuilding12,09313.32024-05-28
Amazon Web ServicesAmazon Web ServicesBuilding12,00613.22024-05-06
QTS Manassas DC1Quality Technology ServicesBuilding11,90313.12026-01-05
COPT Data Centernot recordedBuilding11,88813.02023-07-14
Amazon IAD59Amazon Web ServicesBuilding11,82513.02016-12-16

“First mapped” is when OpenStreetMap recorded the facility, not when it was built — OpenStreetMap carries no construction dates. Mapped area means a building floor plate, campus boundary, or construction polygon according to the “Mapped as” column; those quantities are never added together. The megawatt column appears only for buildings and is their floor-area share of a reported national total, not a measurement.