ZIP codes
6
Area Code 340
Explore ZIP codes in area code 340 — covering VI — 6 ZIP codes. Population, income, and housing at a glance.
Population
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States
VI
Median household income (avg.)
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Average home value
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Where is area code 340?
Area code 340 maps to 6 indexable ZIP codes on US5 across VI.
Among places with the most population in this NPA on US5 are Frederiksted Southeast, VI, Cruz Bay, VI, Christiansted, VI, and Charlotte Amalie West, VI. Open any ZIP below for full demographics, housing, and nearby services.
How area code 340 numbering works
In the North American Numbering Plan, the first three digits of a 10-digit phone number are the Numbering Plan Area (NPA), commonly called the area code. Digits 4–6 are the central office code (NXX / “exchange”), and the last four digits identify the individual line.
US5’s 340 page groups ZIP codes that are associated with this NPA in published geography data. That is a place-based view — it is not a live directory of every phone number assigned to 340, and overlays or split NPAs can mean multiple area codes serve the same metro.
Scams and caller ID spoofing
Seeing area code 340 on caller ID does not prove the caller is physically in VI. Spoofing tools can display almost any NPA, including local-looking numbers used in IRS, bank, warranty, and “grandparent” scams.
If you receive an unexpected call about taxes, arrests, or locked accounts: hang up, do not share codes or remote-access software, and contact the organization using a number from its official website or your statement — not a number the caller provides. US5 publishes geography for research; it does not verify live callers.
ZIP codes in area code 340
| ZIP | City | County | State | Population | Income | Home value |
|---|---|---|---|---|---|---|
| 00802 | Charlotte Amalie West | St. Thomas Island | VI | — | — | — |
| 00820 | Christiansted | St. Croix Island | VI | — | — | — |
| 00830 | Cruz Bay | St. John Island | VI | — | — | — |
| 00840 | Frederiksted Southeast | St. Croix Island | VI | — | — | — |
| 00850 | — | St. Croix Island | VI | — | — | — |
| 00851 | — | St. Croix Island | VI | — | — | — |
Frequently asked questions
Where is area code 340?
Area code 340 is associated with ZIP codes in VI on US5 (6 ZIP codes). Browse the ZIP table on this page for cities and counties.
How many ZIP codes are in area code 340?
US5 currently lists 6 indexable ZIP codes for area code 340. Counts can change as geography publishes update.
What is an NXX or “number block” in area code 340?
After the area code, the next three digits (NXX) identify a central office / exchange “block” of up to 10,000 numbers. US5 focuses on ZIP geography for 340; for live number assignment details, use official NANPA / carrier resources.
Does a 340 caller ID mean the person is local?
No. Caller ID can be spoofed to show area code 340 even when the caller is elsewhere. Treat unexpected calls about money, arrests, or account lockouts as suspicious and verify through official channels.
How can I avoid phone scams that use area code 340?
Do not trust caller ID alone. Never send gift cards, wire money, or install remote-access apps because a caller claims to be from the IRS, a bank, or tech support. Hang up and call back using a published number from a statement or official website.
What cities use area code 340?
Larger population clusters on US5 for 340 include Frederiksted Southeast, VI, Cruz Bay, VI, Christiansted, VI, and Charlotte Amalie West, VI. Open linked ZIP pages for neighborhood-level demographics.