North American Numbers Source-cited · ownership disclosed
Area code
661
In service
United States · since 1999

Bakersfield / Santa Clarita

Area code 661 serves the southern San Joaquin Valley and the far-northern Los Angeles metropolitan area, including Bakersfield and Santa Clarita. It was created on February 13, 1999 by a split of area code 805.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Bakersfield / Santa Clarita
Type
geographic
Status
in service
In service since
1999
Projected exhaust
2033 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 661 is

Most of Kern County and northern Los Angeles County (Santa Clarita and Antelope valleys), with small portions of Ventura, Santa Barbara and Tulare counties..

Communities served wholly or partly by 661:

BakersfieldSanta ClaritaPalmdaleLancaster

Representative list of principal communities, not exhaustive.

B · Relationships

How it relates to other codes

The codes 661 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?

Split from · 1999 805 Santa Barbara / Ventura / San Luis Obispo 661 was created by splitting the eastern part of area code 805 on February 13, 1999.
What's changing. No overlay; created by geographic split. Ten-digit dialing in effect statewide since the 2021 988 transition.
C · History

How 661 got here

1999-02-13
Area code 661 created in a split of area code 805; the eastern part of 805 was renumbered with the new code.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
704
Prefixes available
96
Thousands-blocks assigned
3,933

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

Compare 661 with another code →
Sources
Wikipedia ↗
Area code 661
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.