I've found the best Cioppino in the United States and it's not in San Francisco, New York or Boston, its served at Il Piccolo Verde restaurant in Brentwood Village, three miles from the Pacific Ocean in Southern California.

It has all the elements of a great fish stew, a combination of crab, clams, and mussels in the shell and other seafood including shrimp, calamari, salmon or halibut served in a bisque made from imported Italian tomatoes and served with a crusty, homemade toasted garlic rubbed bread ($21).

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Source: http://www.examiner.com