North American Numbers Source-cited · ownership disclosed
Area code
645
In service
United States · since 2023

Miami (overlay)

Area code 645 is the third overlay for the Miami region, activated August 4, 2023, serving the same territory as 305 and 786 to relieve number exhaustion.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Miami (overlay)
Type
geographic
Status
in service
In service since
2023
Projected exhaust
2046 Q3

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 645 is

Miami-Dade County and Monroe County (the Florida Keys).

Communities served wholly or partly by 645:

MiamiMiami BeachHialeahKey West

Shares geography with 305/786; representative cities only.

B · Relationships

How it relates to other codes

The codes 645 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Overlay · 2023 305 Miami Third overlay on the 305 service area.
Overlay · 2023 786 Miami (overlay) Overlays same area as 786 as well.
What's changing. Active as the third overlay of the 305/786 area since August 4, 2023.
C · History

How 645 got here

2022-02-25
Florida Public Service Commission authorized 645 as a third numbering resource for the Miami region.
Source: Wikipedia: Area code 645
2023-08-04
Area code 645 activated as an overlay of 305/786.
Source: Wikipedia: Area code 645
D · Capacity

How full it is

Prefixes assigned
92
Prefixes available
708
Thousands-blocks assigned
727

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 645 with another code →
Sources
Wikipedia ↗
Area code 645
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.