Loudoun County DC cluster

Loudoun County in Northern Virginia is the world's most concentrated data centre market, with more hyperscale and colocation capacity per square kilometre than any comparable area. The cluster includes campuses operated by Amazon, Microsoft, Google, Meta, Equinix, Digital Realty, and dozens of others, taking advantage of proximity to Washington DC's fibre networks, available power, and a multi-decade head-start on campus development.

In April 2026, Loudoun's Board of Supervisors approved 268,700 sq ft of additional data centre space despite a Holland and Knight analysis warning the county was losing more than $1 billion per year in forgone tax revenue from data centre exemptions. The county's decision illustrates the tension between fiscal concerns and the employment and real estate tax base data centres provide. Virginia as a state loses more than $1 billion annually to data centre tax exemptions according to Good Jobs First.

Loudoun's density has created grid constraints of its own: Dominion Energy, the primary utility, has warned that the county's power demand growth requires major transmission upgrades. The world's densest DC cluster is also becoming one of the world's most congested grid-connection markets.