The area code in red is Area Code 661; all others in blue are California area codes.Area code 661 is a California telephone area code that covers the majority of California 's Kern County, as well as part of Los Angeles County, Santa Barbara County, and Tulare County.It was split from area code 805 on February 13, 1999.he area code in red is Area Code 661; all others in blue are California area codes.