The 340 area code covers Charlotte Amalie, St. Croix and 2 more places in the U.S. Virgin Islands.
Area code 340 is in the U.S. Virgin Islands, on Atlantic Time. It has been in service since June 1, 1997.
- Where
- Charlotte Amalie, St. Croix and Christiansted, the U.S. Virgin Islands
- Time zone
- Atlantic Time
- In service since
- June 1, 1997
- Shares its area with
- No other area code
- Prefixes in use
- 58
- How to dial
- Local calls inside 340 can still be dialed with just 7 digits.
Find out who called you from a 340 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 (340) number is on today, use our free carrier lookup.
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Charlotte Amalie holds 72% of the phone prefixes in area code 340.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 58 prefixes in use shows where 340 numbers are actually given out.
- Charlotte Amalie42 prefixes, 72%
- St. Croix7 prefixes, 12%
- Christiansted7 prefixes, 12%
- Frederiksted2 prefixes, 3%
Innovative Telephone holds the most phone number prefixes in area code 340: 17 of 58.
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 58 prefixes in use in 340 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| Innovative Telephone | 17 | 29% |
| Liberty Mobile USVIMobile network | 16 | 28% |
| Vitelcom Cellular | 8 | 14% |
| T-MobileMobile network | 6 | 10% |
| Lumen | 4 | 7% |
| Metro by T-MobileT-Mobile's prepaid brand | 2 | 3% |
| 5 other carriers | 5 | 9% |
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.
340 has covered the same ground since 1997.
1997
340 starts on June 1, 1997, split off from 809.
A 340 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.
These are the questions people ask most about area code 340.
Where is area code 340?
340 covers Charlotte Amalie, St. Croix, Christiansted and Frederiksted in the U.S. Virgin Islands.
What cities use area code 340?
The places holding the most 340 prefixes are Charlotte Amalie, St. Croix, Christiansted and Frederiksted. The count comes from NANPA's prefix assignments as of October 1, 2026.
Which phone company owns area code 340?
No single phone company owns 340. NANPA's records show Innovative Telephone holds the most 340 prefixes, 17 of 58, followed by Liberty Mobile USVI and Vitelcom Cellular. Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 340 in?
340 is on Atlantic Time.
When did area code 340 start?
340 went into service on June 1, 1997, when it was split off from 809.
How do I dial a 340 number?
Local calls inside 340 can still be dialed with just 7 digits.
Is 340 a toll-free number?
No. 340 is a regular area code for Charlotte Amalie and St. Croix in the U.S. Virgin Islands, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
Who called me from a 340 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 340 a scam?
340 is a real the U.S. Virgin Islands 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.