The 661 area code is located in the state of California, and according to Intelius data, covers roughly 787,610 phone numbers and 1,126,945 listings across 686 prefixes.
This is a General Purpose Code, in service since February 13, 1999.
Area code 661 was split from area code 805.
Local and long-distance calls within area code 661 both require 7 digits dialing.
Have you received a call from a number with a 661 area code? Figure out who is calling you by performing a reverse phone lookup search. Intelius can provide you with a phone report that includes (when available) original line type and carrier, the number owner’s name, last known address and past addresses, age, possible relatives, and more.
| County Population (2025) | 9,694,934 |
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| County Population (2025) | 830,851 |
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