Look up any phone number starting with 661 to identify the owner name, address, spam reports, and more. The 661 area code serves the southern part of the San Joaquin Valley and the far northern part of the Los Angeles metropolitan area, in the U.S. state of California.
Look Up a 661 Phone Number
Enter a full 10-digit number to identify the caller and whether it has been reported as spam.
Federal Data
State Data
County Data
City Data
/661
Where Is Area Code 661 Located?
The numbering plan area includes most of Kern County, most of northern Los Angeles County (specifically the Santa Clarita Valley, the Antelope Valley and the surrounding mountains), and small parts of Ventura County, Santa Barbara County, and Tulare County.
Area code 661 is a general purpose code which was placed in service on February 13, 1999.
Phone Number Prefixes and Carriers
Our California phone number lookup for the 661 area code analyzes the three-digit prefix to identify the initially assigned telecommunications company and rate center. This prefix code data may help to determine the U.S. carrier, California geographic region, and local calling area associated with the phone number.
Phone numbers follow the following structure under the North American Numbering Plan:
NPA- area code (where the number was originally assigned)
NXX - Central office code that locates the specific neighborhood and identifies the service provider
XXXX - Subscriber number identifies the individual phone line within that local exchange
Understanding the area code can help you determine if a call is local to your area. However, keep in mind that due to mobile number portability and VoIP services, the caller may be anywhere in the United States, so it’s best to search for the most recent phone number details.
Prefixes by Company
Company
Number of Prefixes
PACIFIC BELL
138
NEW CINGULAR WIRELESS PCS, LLC
44
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA
28
FRONTIER CALIFORNIA INC.
27
SPRINT SPECTRUM, L.P.
23
LEVEL 3 COMMUNICATIONS, LLC - CA
18
T-MOBILE USA, INC.
14
ONVOY, LLC - CA
12
O1 COMMUNICATIONS, INC. - CA
11
LEVEL 3 TELECOM OF CALIFORNIA, LP - CA
9
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS
9
AT&T - LOCAL
7
BANDWIDTH.COM CLEC, LLC - CA
7
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA
7
TELEPORT COMMUNICATIONS AMERICA, LLC - CA
6
PAETEC COMMUNICATIONS, INC. - CA
4
AT&T CORP.
3
BRIGHT HOUSE NTWS INFORMATION SVCS (CALIFORNIA) CA
3
METROPCS NETWORKS, LLC
3
METROPCS, INC.
3
33 WIRELESS INC.
1
CENTURYLINK COMMUNICATIONS, LLC
1
INTRADO COMMUNICATIONS, LLC
1
MCIMETRO ACCESS TRANSMISSION SERVICES LLC
1
NUSO, LLC
1
PACIFIC BELL (COMPETITIVE)
1
PEERLESS NETWORK OF CALIFORNIA, LLC - CA
1
RADIANTIQ LLC
1
TIME WARNER CBL INFO SVCS (CA) DBA TIME WARNER CAB
1
UTILITY TELECOM GROUP, LLC - CA
1
XO CALIFORNIA, INC.
1
YMAX COMMUNICATIONS CORP. - CA
1
Carrier names have been updated from their original FCC assignments to reflect current companies following mergers, acquisitions, and rebranding. Updates were determined using AI-assisted research and may not be accurate or reflect up to date changes. This data is provided without warranties of accuracy or completeness.
Prefixes by Rate Center
Rate Center
Number of Prefixes
BKFD MAIN
106
PLDL PLDL
55
SNCA NHCS
52
LANCASTER
34
BKFD SOUTH
32
SNCA SGCC
20
BKFD NORTH
19
DELANO
8
TAFT
7
ARVIN
6
EDWARDS
6
TEHACHAPI
6
LEBEC
5
MOJAVE
4
SHAFTER
4
MCFARLAND
3
PLDL AGDL
3
WASCO
3
HI VISTA
2
LAKEHUGHES
2
LOST HILLS
2
BUTTONWLLW
1
CLFRNHTSPG
1
CUYAMA
1
EARLIMART
1
GLENNVILLE
1
MCKITTRICK
1
PLDL LNVY
1
ROSAMOND
1
WALKERBSIN
1
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