North American Numbers Source-cited · ownership disclosed
Area code
305
In service
United States · since 1947

Miami

Area code 305 was Florida's original area code, assigned in 1947 as the state's single numbering plan area. It now serves Miami-Dade County and the Florida Keys.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Miami
Type
geographic
Status
in service
In service since
1947
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 305 is

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

Communities served wholly or partly by 305:

MiamiMiami BeachHialeahCoral GablesKey West

Representative cities; not exhaustive.

B · Relationships

How it relates to other codes

The codes 305 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?

Spawned · 1953 813 Tampa Western peninsula split off as 813.
Spawned · 1965 904 Jacksonville North Florida became 904 (1965-1966).
Spawned · 1988 407 Orlando East coast/Orlando region split as 407 on April 16, 1988.
Spawned · 1995 954 Fort Lauderdale Broward County split as 954 on September 11, 1995.
Overlay · 1998 786 Miami (overlay) Overlay installed on Miami-Dade March 1, 1998.
Overlay · 2023 645 Miami (overlay) Third overlay activated August 4, 2023.
What's changing. Overlaid by 786 (since 1998) and 645 (since 2023); ten-digit dialing required.
C · History

How 305 got here

1947
Florida assigned area code 305 as a single statewide numbering plan area.
Source: Wikipedia: Area code 305
1953
Western peninsula split off as area code 813.
Source: Wikipedia: Area code 305
1965
North Florida became area code 904 (article gives 1965-1966).
Source: Wikipedia: Area code 305
1988-04-16
East coast/Orlando region became area code 407.
Source: Wikipedia: Area code 305
1995-09-11
Broward County split as area code 954.
Source: Wikipedia: Area code 305
1998-03-01
Area code 786 installed as overlay on Miami-Dade County.
Source: Wikipedia: Area code 305
2023-08-04
Area code 645 activated as third overlay.
Source: Wikipedia: Area code 305
D · Capacity

How full it is

Prefixes assigned
798
Prefixes available
2
Thousands-blocks assigned
1,777

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

Compare 305 with another code →
Sources
Wikipedia ↗
Area code 305
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.