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661 Area Code

Area Code Overview

Area code 661 is a geographic telephone area code in California that went into service on February 13, 1999. The geographic regions covered by this area code overlay has a population of approximately 1,427,039.

Overlay and Dialing Rules

  • Area Code: 661
  • State: California
  • Type: General Purpose Code
  • In Service Date: February 13, 1999
  • Overlay Complex: 661
  • Local Dialing Plan: This area does not require you to dial the area code when calling locally.

Estimated Number of Assigned Phone Numbers in Area Code 661

This area code is ranked 163rd out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 23rd out of 39.

5,338,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 661

Total assigned 5,338,000
Wireless
2,607,000 assigned
48.84%
Wireline and VoIP
2,408,000 assigned
45.11%
Other / Unclassified
323,000 assigned
6.05%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 661

Estimated assigned wireless phone numbers: 2,607,000

Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.

T-Mobile 1,046,000 (40.12%)
AT&T Wireless 898,000 (34.45%)
Verizon Wireless 632,000 (24.24%)
33 WIRELESS INC. 30,000 (1.15%)
Optimum Mobile 1,000 (0.04%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 661

Estimated assigned wireline and VoIP phone numbers: 2,408,000

AT&T 773,000 (32.10%)
Onvoy 540,000 (22.43%)
Bandwidth 283,000 (11.75%)
Lumen 151,000 (6.27%)
Verizon 120,000 (4.98%)
Spectrum 116,000 (4.82%)
UTILITY TELECOM GROUP, LLC - CA 92,000 (3.82%)
Peerless Network 73,000 (3.03%)
TIME WARNER CBL INFO SVCS (CA) DBA TIME WARNER CAB 67,000 (2.78%)
TERRA NOVA TELECOM INC. 43,000 (1.79%)
Telnyx 40,000 (1.66%)
Commio 27,000 (1.12%)

Other / Unclassified Assigned Numbering in Area Code 661

Estimated assigned other or unclassified phone numbers: 323,000

BRIGHT HOUSE NTWS INFORMATION SVCS (CALIFORNIA) CA 63,000 (19.50%)
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 59,000 (18.27%)
AMERICAN MESSAGING SERVICES, LLC 50,000 (15.48%)
TELEPORT COMMUNICATIONS AMERICA, LLC - CA 47,000 (14.55%)
IP HORIZON LLC 22,000 (6.81%)
SHELCOMM 20,000 (6.19%)
FRACTEL, LLC 18,000 (5.57%)
NORTH COUNTY COMMUNICATION CORPORATION - CA 10,000 (3.10%)
SPOK, INC. 10,000 (3.10%)
TON80 COMMUNICATIONS, LLC 10,000 (3.10%)
HD CARRIER LLC 9,000 (2.79%)
INTEGRATED PATH COMMUNICATIONS, LLC - CA 2,000 (0.62%)

Cities and Towns in Area Code 661

Arvin, California Bakersfield, California Buttonwillow, California Cuyama, California Delano, California Earlimart, California Edwards, California Glennville, California Hi Vista, California Lake Hughes, California Lancaster, California Lebec, California Lost Hills, California Mc Farland, California Mc Kittrick, California Mojave, California Palmdale, California Rosamond, California Santa Clarita, California Shafter, California Taft, California Tehachapi, California Walker, California Wasco, California

How These Figures Were Built

These figures are estimates based on public phone-number assignment records. They are meant to show the likely mix of assigned phone numbers associated with area code 661, not live customer counts.

Some providers may have assigned phone numbers tied to this area code even if they do not actively market or sell service locally. These figures reflect public number-assignment records, not confirmed local service availability.

They also do not reflect number portability at the individual phone-number level, so some numbers may now be used on a different network or by a different provider than the original assignment records suggest.

Population data and locality matching provided by GeoNames.

Last refreshed: April 15, 2026 6:22 pm