571 Area Code: Complete Guide to Northern Virginia Calling

Introduction

The 571 area code serves northern Virginia as an overlay for the 703 prefix — covering one of the most strategically significant regions in the United States, from Arlington and Alexandria directly across the Potomac River from Washington D.C. to the Dulles Technology Corridor's data centers, defense contractors, and federal campuses stretching west to Loudoun County. Whether you are tracing an incoming 571 area code call, looking for a 571 phone number for a northern Virginia business, or trying to understand the telecom history behind this busy D.C.-metro prefix, this guide has every answer. You will find every major city in the 571 territory, Eastern Time zone details, the full overlay history from its 703 predecessor, and the simplest path to activating your own virtual number without moving to Virginia. Northern Virginia is one of the most connected regions in the world — read on to understand exactly what calling into it means.

Key Takeaways

• The 571 area code is an overlay for the 703 area code, meaning both serve the same northern Virginia geography simultaneously without dividing the territory.
• Arlington is the flagship city of the 571 area code region, home to Amazon HQ2, the Pentagon, and one of the most in-demand commercial real estate markets in the country.
• The 571 prefix was introduced in November 2000 to address number exhaustion in the 703 code, which has served northern Virginia since 1947.
• The 571 area code observes Eastern Time (EST/EDT), placing northern Virginia in the same time zone as New York City, Philadelphia, and Washington D.C.
• You can get a 571 phone number from a virtual provider in minutes without relocating to Virginia or the D.C. metro area.

What Is the 571 Area Code and Where Is It Located?

The 571 area code is a telephone overlay serving northern Virginia — the same geographic territory covered by the original 703 area code. Because 571 is an overlay rather than a geographic split, both prefixes operate across every county and city in the region simultaneously. Residents, businesses, and government agencies in the same building may hold 703 or 571 numbers depending solely on when their number was originally assigned. All callers within the region must dial ten digits for every call — including local ones — because two different area codes share the same geography.

Northern Virginia — the heart of the 571 area code — is the suburban and exurban ring that wraps around Washington D.C.'s western and southern flanks, spanning Arlington, Fairfax, Loudoun, and Prince William counties along with several independent cities including Alexandria, Falls Church, and Manassas. The region is extraordinarily dense with federal agencies, defense and intelligence contractors, technology companies, and the world's single largest concentration of data centers — a corridor that runs along the Dulles Toll Road through Herndon, Reston, Sterling, and Ashburn known as "Data Center Alley." For another Virginia calling region, the 276 area code covers the southwest corner of the state, offering a sharp contrast to northern Virginia's urban tech economy.

571 Area Code Quick Facts

What Is an Overlay Area Code?

An overlay serves the same geography as an existing code rather than splitting it into two sub-territories. When 571 launched, every existing 703 number stayed in place while new assignments drew from the fresh 571 supply. This approach avoided forcing millions of residents, businesses, and federal agencies to change their phone numbers — a disruption that would have been especially costly for northern Virginia's large government and corporate community. The trade-off was mandatory ten-digit dialing across the entire area code 571 and 703 region.

Which Cities Does the 571 Area Code Cover?

The 571 area code serves one of the most economically productive and geographically dense suburban regions in the United States. Here are the most significant communities:

• Arlington — The anchor city of the 571 area code, Arlington sits directly across the Potomac River from Washington D.C. and houses the Pentagon, Amazon HQ2 at National Landing, Ronald Reagan Washington National Airport, and a major technology and consulting sector. Arlington's commercial real estate market is among the most competitive in the eastern United States.
• Alexandria — One of the oldest cities on the East Coast, Alexandria blends a historic Old Town waterfront district with a modern federal and technology employment base. Amazon's HQ2 expansion also extends into Alexandria's Potomac Yard neighborhood, reinforcing the city's status as a primary hub in the 571 region.
• Reston & Herndon — These Fairfax County communities anchor the Dulles Technology Corridor, home to thousands of technology companies, cybersecurity firms, and federal information technology contractors. Reston was the site of one of America's first planned communities and continues to grow as a significant mixed-use tech campus.
• Ashburn & Sterling — Loudoun County's contribution to "Data Center Alley," Ashburn is home to more global internet traffic than any other single location on earth, hosting the data centers of Amazon, Microsoft, Google, and virtually every major cloud provider. Sterling supports the logistics and technology workforce that keeps the corridor running.
• McLean & Tysons Corner — McLean hosts the CIA headquarters and some of the region's most prominent defense and intelligence contractor campuses. Tysons Corner is northern Virginia's primary commercial center, featuring one of the East Coast's largest retail districts alongside major financial, consulting, and technology employers.
• Fairfax, Falls Church, Chantilly & Centreville — Interior Fairfax County communities that anchor the region's residential, educational, and government services economy, with significant spillover employment from federal agencies and major defense program offices.
• Manassas & Woodbridge — Prince William County's commercial centers, combining Civil War heritage with a growing technology and logistics sector in the southwestern portion of the 571 coverage area.

Is Arlington in the 571 Area Code?

Yes — Arlington is the most commercially prominent city in the 571 area codeterritory and one of the densest urban jurisdictions in Virginia. With Amazon HQ2 bringing thousands of high-income technology workers to National Landing, Arlington continues to attract major corporate headquarters, legal firms, and federal consulting agencies that collectively make the 571 prefix one of the most recognized business calling codes on the entire East Coast.

571 Area Code Time Zone

The entire 571 area code observes Eastern Time — EST at UTC-5 during standard time in winter and EDT at UTC-4 during daylight saving time from mid-March through early November. There are no time zone exceptions within the northern Virginia territory — every county and independent city shares Eastern Time uniformly, including Loudoun County's western communities near the West Virginia border.

Scheduling Calls Across Time Zones

When calling a 571 number from the West Coast, you are three hours behind a northern Virginia contact — a 9 a.m. call in Los Angeles reaches Arlington at noon. Central Time callers are one hour behind, and Mountain Time callers are two hours behind. Because the entire D.C. metro area runs on Eastern Time, reaching federal agencies, contractors, and technology companies in the 571 region follows the same schedule as calling New York, Boston, or Philadelphia — the most widely shared business time zone in North America.

The History of the 571 Area Code

To understand the 571 area code, you need to start with its predecessor. When the North American Numbering Plan was established in 1947, all of Virginia received the 703 area code to serve the entire state. Northern Virginia's portion remained under 703 after a 1995 reorganization gave the rest of Virginia its own 540 prefix, concentrating the 703 code entirely on the D.C. metro area. What followed was one of the fastest number exhaustion events in American telecom history.

Why 703 Ran Out of Numbers

Northern Virginia's technology sector exploded through the 1990s, transforming a government-adjacent suburb into one of the largest internet infrastructure hubs in the world. Every data center, every government contractor, every mobile phone issued to the region's enormous federal workforce consumed a fresh telephone number. The 703 supply — which had seemed limitless decades earlier — was visibly exhausted by the late 1990s, with regulators projecting full depletion before the end of 2000.

Why an Overlay Rather Than a Split

Regulators chose an overlay rather than a geographic split because northern Virginia's institutional density made a split prohibitively disruptive. Federal agencies, defense contractors with classified communication networks, and major corporations all faced enormous costs to change established phone numbers. According to NANPA records , the 571 overlay launched in November 2000 with mandatory ten-digit dialing implemented simultaneously, preserving every existing 703 number while opening a new supply to meet the region's continuing growth.

How to Get a Virtual Phone Number from CallMama

CallMama makes it straightforward to get a virtual 571 phone numberwithout relocating to Virginia or the D.C. metro area. With instant activation, transparent pricing, and reliable call quality, CallMama is one of the most accessible platforms for building a credible northern Virginia presence from anywhere in the world.

Why Businesses Choose the 571 Area Code

Few calling regions in the United States carry the institutional weight of the 571 area code. Businesses operating with a northern Virginia prefix signal immediate proximity to the federal government, the defense and intelligence community, and the technology sector that supports both. Arlington's consulting and contracting market — fueled by the Pentagon and Amazon HQ2 — demands vendors who can meet in person and respond to D.C. time zone schedules. Fairfax County's federal IT procurement ecosystem rewards businesses that appear local and credible to government program managers who answer hundreds of calls per week.

A local 571 phone number also removes friction for cybersecurity firms, cloud service providers, and managed service companies targeting the Ashburn data center corridor — one of the most call-intensive B2B environments in the country. Local prefixes consistently outperform toll-free and out-of-state numbers in enterprise answer rates, a dynamic especially pronounced when calling high-security government and defense contexts where unknown numbers are rarely returned. A comparable mid-Atlantic overlay, the 484 area code in eastern Pennsylvania, shows the same local-trust advantage in its own dense suburban tech economy.

571 Area Code Scam Calls: Stay Protected

Like all active U.S. prefixes, the 571 area code is occasionally spoofed by scammers exploiting northern Virginia's association with government authority. Common schemes include Social Security Administration impersonation calls, IRS enforcement fraud, Medicare and Medicaid scams targeting the region's large retiree population in Fairfax and Prince William counties, and tech support fraud claiming to represent federal IT contractors or well-known technology brands headquartered in the Dulles corridor.

Here is how to protect yourself:

• Never assume authority from the area code alone. A 571 number does not confirm the caller is a federal agency, a contractor, or a Virginia business — spoofing is trivially easy for scammers.
• Let unknown calls go to voicemail. Real government agencies and established businesses always leave a message — automatic hang-ups are the hallmark of a robocall.
• Verify through official channels. If a caller claims to represent a federal agency or government contractor, hang up and call the organization directly using a number from its official .gov website.
• Enable STIR/SHAKEN filtering through your carrier to reduce spoofed call delivery to your device.
• Report fraud calls at FTC fraud report to protect the broader northern Virginia community from repeat attempts.

The vast majority of 571 area code calls arrive every day from genuine Arlington consultants, Reston technology companies, Ashburn data center operators, and the federal employees and contractors who make northern Virginia one of the most professionally active calling regions in the country. A quick verification step keeps you safe without missing the connections that matter.

Conclusion

The 571 area code has defined northern Virginia's telephony since November 2000, connecting Arlington's government and technology corridor, Alexandria's historic commercial district, Reston's and Herndon's cybersecurity firms, and Ashburn's globally significant data center campus under one overlay shared with the original 703 prefix. Its consistent Eastern Time coverage makes scheduling with D.C.-metro contacts seamless, and its proximity to federal decision-makers gives the prefix a level of commercial credibility that few codes in the country can match. A 571 phone number delivers immediate local authority across the most connected suburban region in the United States. Understanding area code 571 fully equips you to verify calls, reach northern Virginia contacts with confidence, and make smart decisions about building your D.C.-metro presence.

Northern Virginia's growth shows no signs of slowing — Amazon HQ2 continues to bring high-income workers to Arlington and Alexandria, the Dulles corridor adds data center capacity every quarter, and federal procurement budgets sustain a contractor ecosystem that generates millions of calls per year. The 571 area code sits at the center of all of it, and a virtual area code 571 number gives you immediate access to this entire market without a Virginia office, a D.C. area lease, or a cross-country relocation. Claim your 571 number today and start building the northern Virginia presence that earns real answers from the real decision-makers who drive one of America's most influential regional economies.