645 area code — Miami, FL geographic
645 is the area code for Miami, Florida, in service since August 4, 2023, Eastern time. Together with 305, 786 it forms the 305/645/786 overlay. Because of number portability and VoIP, the area code tells you where the number was issued, not where the caller is right now.
NANPA lists 71 active NXX prefixes in 645, assigned to 16 carriers. 69 of those prefixes are pooled — shared between carriers in thousands-number blocks. The code spans 5 rate centers (billing localities).
Practical takeaway: the 645 label narrows geography to Florida, the prefix narrows it to a locality, and neither authenticates a caller. Verification means calling back through a number you found yourself.
The dialing plan is 10D for home-NPA local calls and 10D across codes.
Official projections put exhaust for the 305/645/786 complex at 3Q 2046.
Its parent code is 305, which it left in 2023.
Largest localities in 645
| Locality (rate center) | Active prefixes | Also served by |
|---|---|---|
| Miami | 35 | 305, 786 |
| North Dade | 12 | 305, 786 |
| Homestead | 9 | 305, 786 |
| Keys | 8 | 305, 786 |
| Perrine | 7 | 305, 786 |
FAQ
Why do 305 and 645 cover the same place?
They are overlays: when a code runs low on numbers, a new code is added over the same territory instead of splitting it. The 305/645/786 complex shares one service area, and local calls are dialed with 10 digits.
Will 645 run out of numbers?
NANPA's current forecast projects exhaust in 3Q 2046 — decades of capacity remain.
Why am I getting spam calls from 645 numbers?
Scammers spoof recognizable area codes so calls look local or familiar. A displayed 645 number does not prove the call originated there — see our guide to spotting spoofed calls.
Where is a 645 number from?
645 is assigned to Miami and surrounding areas of Florida in the Eastern time zone. The three digits after the area code (the prefix) narrow it down to a rate center.