For most of the boom, this arrived as a smaller tax bill and a new school. Loudoun built 22 schools in the last 15 years [7], and The Verge reports that some longtime residents had not heard the phrase Data Center Alley until the effects got hard to ignore [8]. The number moved for a decade before the people it moved for had a name for the thing moving it.
The overshoot is the interesting figure. Buddy Rizer, who joined the county's economic development authority in 2007 after a career as a radio DJ [14], recalls a brief worth four percentage points: about 19 percent of revenue from commercial sources, up to something like 23 [6]. The county landed just over 50 [2]. That is an increase of roughly 31 points against a target of four, about eight times the plan [1]. Over the same stretch the residential real property rate came down 49 cents per $100, roughly 38 percent below its 2008 level [2].
The 2007 pitch was diversification, because residential real estate carried more than 80 percent of revenue and had just cratered [1]. What got built is a different concentration. It was also built on inputs a county cannot vote itself: AOL's hulking empty buildings and miles of fiber already in the ground after the dot-com collapse [10], plus an internet exchange point, land, a government eager for investment and a utility that could serve the load [9].
Loudoun's roughly 250 campuses sit inside a national total of about 3,000 in operation, so something near one in twelve American data centers is in this one county [3]. The $35 million by which data center taxes cleared the entire operational budget in 2024 [4] is a real surplus and a weak forecast. Loudoun has already lived the version where the tenants leave, which is how it came by the empty buildings.
The grid worth handing a county administrator, or anyone whose revenue leans on one class of customer, has two axes: the share of the base a single sector holds, and whether the people paying notice it in daily life. Small share and invisible is where Loudoun sat for years. Large share and invisible is the quadrant that reads as competence right up to the day it stops. Large share and audible is where the county is now, with the constant hum residents hear from their decks and the transmission towers overhead [13], and that is where the politics live. Small share and audible is the byproduct of buying the campuses without the fiber inheritance. The figure that tells you which box you occupy is the share, along with an honest estimate of how long replacing it would take.
