Area Code 213: Los Angeles and the Birth of California's Phone System

213: California's First Area Code

When the North American Numbering Plan launched in 1947, the entire state of California was assigned a single area code: 213. This made sense at the time — California had about 9 million residents, concentrated mainly in Los Angeles and the Bay Area, with vast stretches of unpopulated desert and mountain terrain in between.

The middle digit "1" reflected California's high population status, following the Bell System's convention of assigning low-dial-time codes to populous regions.

The Great California Split

California's population growth has been the most dramatic of any US state. From the 1950s onward, 213 was split repeatedly:

• 1951: 916 split off for Northern California (Sacramento region)
• 1984: 619 split off for San Diego
• 1984: 818 split off for the San Fernando Valley
• 1991: 310 split off for the Westside and South Bay of LA
• 1998: 323 split off for East LA and surrounding communities

213 Today: Downtown Los Angeles

After decades of splits, 213 now covers only the core of downtown Los Angeles — a tiny fraction of its original territory. The code that once served all of California's 163,000 square miles now covers a few dozen. It's one of the most dramatic geographic contractions of any area code in history.

California's Area Code Explosion

Today, California has more area codes than any other state — over 35 active codes serving its population of nearly 40 million people. The California area code page lists them all. The state's ongoing population growth and high density of tech companies, which consume large numbers of phone numbers for business lines and services, ensures that California will likely need additional codes in the coming decades.