664
Area code
Statusin service
Introduced1996-07-01
JurisdictionMONTSERRAT, MONTSERRAT
Local dialing7D
Time zoneAtlantic
Last verified2026-09-17
Area codes serve rate-center geographies, not municipal boundaries. “MONTSERRAT” identifies the jurisdiction, not an exact city footprint.
Change history
Recorded events for this NPA- 1996-07-01Area code 664 entered service (created from 809).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 1996-04-22 | IL-96-04-010 ↗ | NANP-Introduction of New 664 (Montserrat) Numbering Plan Area (NPA) |