San Francisco

San Francisco, California is a major port-city on the Western seaboard of the United States. Supernaturally, it is the city where the Charmed Ones live and has hence attracted many forms of evil to attack innocents in its streets.

Piper once joked regarding the number of warlocks that attack them, "What, are we like in the Warlocks Guide of San Francisco?" ("PreWitched")

Another time, Phoebe asked Paige worriedly that it seemed like all of San Francisco was acting weird. Paige jokingly responded "Besides, everybody is odd in San Francisco, that's why we fit in so well!" ("Sand Francisco Dreamin'")

Background
Charmed is primarily set in San Francisco, though usually filmed in Los Angeles to represent it. Every episode contains establishing shots of the cityscape with such notable landmarks as the Golden Gate Bridge and the Transamerica Pyramid.

The episode titles "Sin Francisco" and "Sand Francisco Dreamin'" are, of course, references to the city.