A staggering share of the world’s internet traffic passes through a stretch of Northern Virginia most people have never heard of. Ashburn, sitting quietly inside Loudoun County, has become so densely packed with data centers that the industry nicknamed it “Data Center Alley,” reportedly routing an outsized percentage of global internet traffic through facilities clustered along a few unremarkable suburban roads. That’s the kind of hidden infrastructure sitting inside this area code, alongside the federal government presence most people already associate with the DC suburbs.
Northern Virginia, At a Glance
| Category | Details |
| State | Virginia, USA |
| Coverage Area | Arlington, Alexandria, Fairfax, Ashburn |
| Went Into Service | March 1, 2000 |
| Time Zone | Eastern Time (EST: UTC-5 / EDT: UTC-4) |
| Overlays With | 703 |
| Counties Covered | Arlington, Fairfax, Loudoun, Prince William |
An Overlay Born From Federal Growth
571 launched on March 1, 2000, as an overlay directly on top of 703, which had served all of Northern Virginia since the original 1947 numbering plan. The combination of federal government expansion, military installations, and a booming technology sector pushed phone demand in this corridor high enough that regulators chose to layer a second code onto identical territory rather than force a geographic split across such a densely interconnected region.
The Pentagon Sits Inside This Territory
Arlington anchors much of this code’s federal identity, home to the Pentagon itself alongside a genuine concentration of government contractors and military-adjacent businesses. That federal presence, combined with the sheer number of agencies and contractors clustered just across the Potomac from Washington DC, gives Northern Virginia one of the most government-dependent economies of any American suburb.
Data Centers Hiding in Plain Suburban Sight
Ashburn’s data center concentration deserves particular attention because it’s genuinely invisible to most visitors passing through. Unlike a factory or office tower, these facilities sit behind unmarked fencing and nondescript buildings, yet they collectively process a remarkable share of the world’s cloud computing and internet traffic, making this quiet Loudoun County suburb one of the most technologically significant square miles in the entire country.
Where This Code Actually Reaches
571 overlays the exact same territory as 703, spanning:
- Arlington and Alexandria, both immediately adjacent to Washington DC
- Fairfax County, one of Virginia’s most populous jurisdictions
- Reston and Herndon, home to a substantial technology corridor
- Ashburn and Leesburg in Loudoun County
Alexandria carries its own distinct identity within this footprint, known for its well-preserved Old Town district lined with cobblestone streets, a historic character that sits in sharp contrast to Loudoun County’s ultramodern data centre corridor just a short drive away.
History and Servers Sharing the Same Ground
This code’s territory spans a genuinely wide historical range too. Manassas carries significant Civil War heritage, while George Washington’s Mount Vernon estate sits within easy reach of the same corridor now dominated by federal contractors and cloud infrastructure. Few American regions pack this much historical depth directly alongside cutting-edge digital infrastructure.
Living Inside a Two-Code Overlay
Because 571 and 703 cover identical Northern Virginia geography, two neighbouring offices in Reston or Tysons could easily carry different area codes today, depending purely on when each business registered its line. Ten-digit dialing has applied throughout this overlay region since 571 launched, and both codes function identically for every practical purpose.
Frequently Asked Questions
Q1. Is it true that a small Virginia suburb handles a huge share of global internet traffic?
Yes, this is well documented within the data centre industry. Ashburn in Loudoun County hosts an unusually dense cluster of data centres, earning it the nickname “Data Center Alley” due to the significant volume of global internet and cloud traffic that passes through facilities concentrated there.
Q2. Does a 571 number mean the caller is connected to the federal government specifically?
Not necessarily. While Arlington and the broader DC-adjacent corridor do have a strong federal and military presence, this code also covers substantial technology, healthcare, and general suburban business activity throughout Fairfax and Loudoun counties.
Q3. Is a 571 number less legitimate than an older 703 number for a Northern Virginia business?
Not at all. Both codes overlay identical territory and function completely identically for calls, texts, and business registration, with no functional distinction between them.
Q4. Can a business outside Virginia get a 571 number to establish a Northern Virginia presence?
Yes, virtual number and VoIP providers commonly issue 571 or 703 numbers to businesses anywhere, letting them establish a DC-adjacent presence for government contracting, technology, or general business outreach without needing a physical Virginia office.
