Where is area code 340?
NANPA assigns 340 to U.S. Virgin Islands. The source report does not provide city-level coverage for this record, so this page does not guess a particular city. Browse other codes in U.S. Virgin Islands
Verified area-code information
340 Area Code
340 is an in-service United States area code assigned to U.S. Virgin Islands. It identifies a numbering region, not a caller’s current location.
Official Numbering RegionVerified NANPA Assignment
U.S. Virgin IslandsArea Code 340
Country: United States•Time Zone: Atlantic•In Service: 01-Jun-1997
- Numbering country
- United States
- Area-code type
- Geographic
- Numbering region
- U.S. Virgin Islands
- Time-zone information
- Atlantic
- In service since
- 01-Jun-1997
View the official area-code maps ↗. Maps show numbering areas, not a caller’s location.
Time zones associated with 340
NANPA lists Atlantic for this numbering area. These are numbering-region time zones, not a caller’s current location.
Atlantic time
An area code can span more than one time zone. Local daylight-saving rules may differ.
How do you dial a 340 number?
Use the North American country calling code +1 followed by the three-digit area code and seven-digit local number. For example, write the pattern as +1 340 XXX XXXX. Local dialing rules and charges depend on your location and provider. Check a supported dialing format or check NANPA’s 10-digit dialing list.
Assigned prefixes in 340
NANPA’s US report listed 58 assigned prefixes on 2026-09-29. These are code assignments, not a count of active phone numbers or proof of a caller’s current carrier. Search any US area code and prefix.
Top rate-center labels by assigned prefixes
| Rate center | Assigned prefixes |
|---|---|
| CHTAMSTTHS | 42 |
| CHNSTDSTCR | 7 |
| ST CROIX | 7 |
| FRKSTDSTCR | 2 |
Top listed companies by assigned prefixes
| Assignment company | Assigned prefixes |
|---|---|
| VIRGIN ISLANDS TEL. CORP. DBA INNOVATIVE TELEPHONE | 17 |
| LIBERTY MOBILE USVI INC. | 16 |
| VITELCOM CELLULAR, INC. | 8 |
| T-MOBILE USA, INC. | 6 |
| LUMEN TECHNOLGIES ST. CROIX, LLC | 4 |
340 prefix lookup
58 assigned prefixes are listed for this area code. Search NANPA’s US central-office code assignments. The listed company and rate center describe an assignment; number portability means they cannot identify the current carrier, subscriber, or caller.
The area-code file loads when you search. The three-digit prefix stays in your browser.
Check a number with area code 340
Enter the full ten-digit number to see its structure and formatting. The check stays in your browser.
Check a 340 number
Enter a 10-digit +1 North American number. We check its structure and area-code record, not the caller’s identity or whether the line is active.
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Received an unfamiliar call?
The displayed number may be spoofed. Do not rely on an area code as proof of caller identity. If the caller claims to represent a business, end the call and contact that business using a number you found independently.
Common questions about 340
What time zone is area code 340 in?
340 is assigned to U.S. Virgin Islands, and the NANPA record associates it with Atlantic time. A phone number does not reveal its owner’s current time zone. The clock above uses a representative time zone for the numbering area.
Does 340 mean the caller is in U.S. Virgin Islands?
No. An area code is an assignment, and a person can travel, move, use internet calling, or display a spoofed number.
Can this page identify who called?
No. OfficialAreaCode has no live subscriber directory or spam-report database.