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> The correct title for Californians is "The 5".

You have omitted the rather important qualifier “Southern” from your description, as that usage is a key differentiator between Northern and Southern California.

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I live in the bay area and everyone I know calls it "I-5". "Everyone I know" of course could be biased though as most of my circle did not grow up in California.

“In Southern California, the definite article “the” gets placed before just about every freeway or highway, whereas in the Bay Area just the numbers are said.”

— https://www.kcbx.org/post/how-you-refer-us-101-says-lot-abou...

I lived in Southern California (Orange County) in the 70s and 80s. We called I-5 the 5. Same for the 405, the 101, the 15, the 10, the 99. Also, we called State Route 1 (aka Highway 1) PCH no matter where it was located in the state, even though SR1 only has the Pacific Coast Highway designation between Oxnard and Dana Point.

I moved to Northern California (Santa Clara County) in the late 80s and I still use the same monikers. If I take a trip to Big Sur, I tell folks I am going to take the 17 to PCH and drive down. Old habits die hard.

https://www.kcet.org/shows/lost-la/the-5-the-101-the-405-why...

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