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The not-so-trivial but rather unique information concerning pizza in America includes:
And relatable to Southern California
The oldest pizzeria in Los Angeles is most likely
The oldest restaurant in Los Angeles is: 10 Oldest Restaurants in Los Angeles - Oldest.org
"Although The Original Saugus Café is technically located closer to Santa Clarita, it is the oldest restaurant in Los Angeles county as it was first opened way back in 1886."
A Handy Guide to 25 Iconic Pizzerias in Los Angeles (eater.com)