Area Code 340

About Area Code 340

Area code 340 is a geographic telephone area code assigned to Charlotte Amalie, United States. It operates in the Atlantic time zone and was first introduced in 2004. U.S. Virgin Islands.

When you receive a call from a 340 number on your Caller ID, the call originated from a phone number assigned to the 340 area code — but be aware that Local Number Portability (in effect since 2003) means the caller could be physically located anywhere in the US or Canada. Area code 340 only confirms where the number was originally assigned.

Where is the 340 area code located?

Area code 340 is assigned to Charlotte Amalie, in the Atlantic time zone. Calls placed from the 340 area code originate from numbers assigned by NANPA — the North American Numbering Plan Administrator — and the 340 prefix appears on Caller ID for both landline and wireless calls placed from this region.

The Atlantic time zone observes Daylight Saving Time, shifting from UTC-4 to UTC-3 in summer. The local time shown above is always current, so you can quickly check whether it's a reasonable hour to call back.

What cities and counties use the 340 area code?

The 340 area code primarily serves Charlotte Amalie. Detailed city-level data is shown in the table below when available; for non-US or special codes, the primary city listed above reflects the most well-known location associated with the code.

Phone number format in area code 340

All phone numbers within area code 340 follow the standard North American 10-digit format:(340) NXX-XXXX. The NXX is the central office prefix (also called an "exchange") and XXXX is the subscriber line number. For long-distance calls within the NANP, dial 1 + 340 + NXX + XXXX. From outside North America, dial your country's international access code, then 1 (the NANP country code), then the 10-digit number.

If you need to verify whether a specific 340 number is wireless, landline, or VoIP, you can use our reverse phone lookup tool. Be aware that number portability means the area code no longer guarantees the caller's physical location — only where the number was first assigned.

History of area code 340

U.S. Virgin Islands.

The original 86 area codes were assigned by AT&T and Bell Labs in 1947 as part of the North American Numbering Plan. At the time, rotary-dial phones meant codes with lower digits (like 212 for NYC, 213 for LA, 312 for Chicago) were given to the largest cities because they took less time to dial. Today's area code assignments still reflect those early choices, even though touch-tone and cell phones made the original reason obsolete.

Is the 340 area code safe to answer?

Area code 340 itself is a normal geographic code with no elevated spam risk. That said, scammers can spoof any area code — including 340 — so if you don't recognize the full number, let it go to voicemail and verify the caller's identity before calling back.