North American Numbers Source-cited · ownership disclosed
Area code
279
In service
United States · since 2018

Sacramento (overlay)

Area code 279 is an all-services overlay of area code 916, serving the Sacramento metropolitan area. It went into service on March 10, 2018.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Sacramento (overlay)
Type
geographic
Status
in service
In service since
2018
Projected exhaust
2063 Q2

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 279 is

Sacramento metropolitan area across five counties: El Dorado, Placer, Sacramento, Sutter, and Yolo (identical footprint to 916)..

Communities served wholly or partly by 279:

SacramentoFolsomRosevilleElk GroveCitrus Heights

Identical service area to 916.

B · Relationships

How it relates to other codes

The codes 279 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 · 2018 916 Sacramento 279 overlays the same geography as parent code 916.
What's changing. Active overlay of 916; ten-digit dialing is in effect.
C · History

How 279 got here

2017
CPUC approved an overlay area code to take effect in 2018 to address exhausted central office codes in 916.
Source: Wikipedia
2018-03-10
Area code 279 began service as an overlay of 916.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
162
Prefixes available
638
Thousands-blocks assigned
1,429

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

Compare 279 with another code →
Sources
Wikipedia ↗
Area codes 916 and 279
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.