The 571 area code covers the same area as 703, including Washington, D.C. suburbs, Herndon and 8 more places in Virginia.
Area code 571 is in Virginia, on Eastern Time. In the 571 area, phone numbers are given out most in Fairfax County, then Prince William and Loudoun counties. It has been in service since March 1, 2000. 703 covers the same area, so two neighbours can have different area codes.
- Where
- 4 counties in Virginia, mostly Fairfax County, Prince William County and Loudoun County
- Time zone
- Eastern Time
- In service since
- March 1, 2000
- Shares its area with
- 703 (since 1947)
- Prefixes in use
- 632
- How to dial
- Local calls need all 10 digits: 571-555-0142.
Find out who called you from a 571 number.
Enter the full 10-digit number to see who it is listed to and the city and state on the listing. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup. To see whether it is a mobile, a landline or a VoIP line, use our free VoIP checker. To see which carrier a (571) number is on today, use our free carrier lookup.
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Washington, D.C. suburbs holds 48% of the phone prefixes in area code 571.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 632 prefixes in use shows where 571 numbers are actually given out.
- Washington, D.C. suburbs306 prefixes, 48%
- Herndon74 prefixes, 12%
- Leesburg48 prefixes, 8%
- Manassas40 prefixes, 6%
- Occoquan21 prefixes, 3%
- Triangle15 prefixes, 2%
- Haymarket13 prefixes, 2%
- Lorton7 prefixes, 1%
Also served: Haymarket and Nokesville.
T-Mobile holds the most phone number prefixes in area code 571: 101 of 632.
NANPA, which runs the North American numbering plan, assigns each prefix (the three digits after the area code) to one carrier. Here is how the 632 prefixes in use in 571 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| T-MobileMobile network | 101 | 16% |
| AT&T MobilityMobile network | 89 | 14% |
| Metro by T-MobileT-Mobile's prepaid brand | 29 | 5% |
| Teleport (AT&T)AT&T's business phone network | 27 | 4% |
| BandwidthSupplies numbers to VoIP and app-based phone services | 25 | 4% |
| PAETEC (Windstream)Windstream's business phone network | 21 | 3% |
| 31 other carriers | 340 | 54% |
96% of these prefixes are pooled, which means the blocks of 1,000 numbers inside them can belong to other carriers. Any number can also have been moved to another carrier since, so this shows who holds the prefixes, not who serves a given number.
Want the carrier of one exact number? Our free carrier lookup checks it, because numbers move between carriers.
Source: NANPA central office code assignments, October 1, 2026.
571 started in 2000 as an overlay on 703, and its ground has not changed since.
2000
571 starts on March 1, 2000, as an overlay on 703: new numbers on the same ground.
A 571 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
The area codes closest to 571 are 202, 301 and 410.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
These are the questions people ask most about area code 571.
Where is area code 571?
571 covers Washington, D.C. suburbs, Herndon, Manassas and Leesburg and 6 more places in Virginia. In the 571 area, phone numbers are given out most in Fairfax County, then Prince William and Loudoun counties.
What state is area code 571 in?
Virginia. 571 is a Virginia area code on Eastern Time.
What cities use area code 571?
The places holding the most 571 prefixes are Washington, D.C. suburbs, Herndon, Manassas, Leesburg, Occoquan, Triangle, Lorton and Dulles, out of 10 places in all. The count comes from NANPA's prefix assignments as of October 1, 2026.
Which phone company owns area code 571?
No single phone company owns 571. NANPA's records show T-Mobile holds the most 571 prefixes, 101 of 632, followed by AT&T Mobility and Metro by T-Mobile. Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 571 in?
571 is on Eastern Time.
When did area code 571 start?
571 went into service on March 1, 2000, as an overlay on 703: new numbers for the same area.
Is 571 the same area as 703?
Yes. 703 (since 1947) covers the same ground as 571. Nobody's number changed when it was added; new lines simply get whichever code has numbers left, so two neighbours can have different codes.
How do I dial a 571 number?
Local calls need all 10 digits: 571-555-0142.
Is 571 a toll-free number?
No. 571 is a regular area code for Washington, D.C. suburbs and Herndon in Virginia, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
What area codes are near 571?
The closest are 202/771 (Washington, D.C.), 301/240/227 (Washington, D.C. suburbs, Maryland), 410/443/667 (Baltimore, Maryland) and 717/223 (Harrisburg, Pennsylvania), measured between the centres of each area.
Who called me from a 571 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 571 a scam?
571 is a real Virginia area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Put this lookup on your site: our free area code widget takes two lines of code and shows any US area code's state, time zone and local time.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.