Area code 664: Montserrat
Area code 664 is an area code for Montserrat, which is part of the North American Numbering Plan but not the US or Canada. It is on Atlantic Standard Time. NANPA lists no overlay code for it. Calls to it from the US and Canada are international calls. Local calls there take 7 digits.
Local time in area code 664
America/Montserrat
Prefixes in service
No public data
Administered by the country's own regulator
Area code 664 facts
| Location | Montserrat |
|---|---|
| Time zone | Atlantic Standard Time |
| Overlays | None |
| Split from | 809 |
| In service since | July 1, 1996 |
| Local calls | 7 digits; toll calls 1 + 10 digits |
| Carrier | Not shown. An area code is where a number was issued; numbers port between carriers. Check line type |
How do I dial a 664 number?
NANPA's dialling plan for 664: local calls inside the code take 7 digits, toll calls 1 + 10 digits. Montserrat is a separate country or territory inside the North American Numbering Plan, so a call there from the US or Canada is dialled like a domestic one but billed as international. The examples use 555-0147, from a range reserved for fictional numbers.
| Local call inside 664 | 555-0147 |
|---|---|
| From the US or Canada | 1-664-555-0147 |
| From outside North America | +1 664 555 0147 |
| E.164, for CRMs and SMS tools | +16645550147 |
When did area code 664 start?
Area code 664 went into service on July 1, 1996, split from 809. It has no overlay, so every number in its area still starts with it.
Tools for 664 numbers
- Area code lookup
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- Area code time zone
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- NPA-NXX lookup
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- TCPA calling hours checker
Whether it's inside the federal 8 a.m. to 9 p.m. calling window there now.
Next step
A 664 number tells you where it was issued, not what it is now.
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Area code 664 questions
- What country is area code 664?
- Area code 664 is in Montserrat.
- What time zone is area code 664 in?
- Atlantic Standard Time.
- Does area code 664 have an overlay?
- Not as of NANPA's file dated 10/16/2026. Every number in its area uses 664.
- When did area code 664 start?
- Area code 664 went into service on July 1, 1996, split from 809.
- Is a 664 number a cell phone or a landline?
- The area code can't tell you. In the US and Canada mobiles, landlines and VoIP lines share area codes and prefixes, and numbers move between carriers and line types. Only a live line-type lookup answers it for one number.
Sources
Location, overlays, in-service date and dialling plan: NANPA NPA database, file dated 10/16/2026. Time zones mapped to the IANA time zone database. By the SimpleVerifier Team; how we build these pages.