North American Numbers Source-cited · ownership disclosed
Area code
854
In service
United States · since 2015

Charleston (overlay)

South Carolina's first all-service overlay, added over area code 843 in 2015 to serve the exhausting eastern/coastal numbering plan area.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Charleston (overlay)
Type
geographic
Status
in service
In service since
2015
Projected exhaust
2053 Q1

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 854 is

Eastern third and southern tip of South Carolina; identical 14-county territory to 843..

Communities served wholly or partly by 854:

CharlestonMyrtle BeachBeaufortHilton Head IslandFlorence

Serves the same geographic area as 843.

B · Relationships

How it relates to other codes

The codes 854 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 · 2015 843 Charleston Overlay laid on top of the 843 coastal/eastern territory.
What's changing. Active overlay of 843 since March 2015.
C · History

How 854 got here

2013-12-16
Announced as the state's first all-service overlay of 843.
Source: Wikipedia
2015-03-14
Entered service.
Source: Wikipedia
2015-09-19
Ten-digit dialing became mandatory.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
195
Prefixes available
605
Thousands-blocks assigned
1,405

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

Compare 854 with another code →
Sources
Wikipedia ↗
Area code 854
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.