Greenville (overlay)

An overlay of area code 864, added in 2024 to relieve number exhaustion in the Upstate region of western South Carolina.

The essentials Numbering data · NumberResearch · as of 2026-09-18

Place

Type

geographic

Status

in service

In service since

2024

Projected exhaust

2054 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 821 is

Western third of South Carolina (Upstate); identical territory to 864..

Communities served wholly or partly by 821:

GreenvilleSpartanburgAndersonClemsonGreerMauldinGaffney

Serves the same geographic area as 864.

B · Relationships

How it relates to other codes

The codes 821 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 · 2024 864 Greenville Overlay laid on top of the 864 Upstate territory.

What's changing. Active overlay of 864 (2024). Re-check NANPA for current activation status.

C · History

How 821 got here

2024-01-19

Permissive dialing period began (ran through July 19, 2024).

Source: Wikipedia

2024-08-19

In-service date.

Source: Wikipedia

D · Capacity

How full it is

Prefixes assigned

Prefixes available

744

Thousands-blocks assigned

311

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

Compare 821 with another code →

Sources

Wikipedia ↗

Area code 821

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.