While the comics made it out to exist in Japan, the film's incarnation of San Fransokyo takes place in the United States, most likely in California where San Francisco exists.
According to Scott Watanabe, San Fransokyo is set in an alternate future where after the 1906 earthquake, San Francisco was rebuilt by Japanese immigrants using techniques that allowed movement and flexibility in a seismic event. After the city was finished being rebuilt, it was renamed San Fransokyo due to it being a city with Japanese and American architecture combined. San Fransokyo exists as a fictionalized amalgam of San Francisco, California and Tokyo, Japan. The architecture and culture is virtually the same as San Francisco, but garnished with various alterations that resemble aspects of Japanese culture, including a higher amount of Japanese-written language in public areas and English casually written in an Asian-style font.
For example, the San Fransokyo Bridge has a hybrid-design of the original bridge along with a design of some of Japan's spirit bridges.
While not entirely different from a modern-day city, the technology in San Fransokyo appears to be much more advanced.
San Fransokyo Police StationEdit
An educational institution where Hiro and the team have studied.
Alistair Krei's building for innovations and technological inventions.
An area near the bay of San Fransokyo. A few feet away lies the abandoned warehouse that served as the lair of Yokai for a period of time.
Is an island off the coast of San Fransokyo used by Krei as a testing facility for his experiental teleportation. This its failure, it was used by Yokai as a secret location to enact his revenge.
Good Luck AlleyEdit
A dark alley notorious for homing San Fransokyo's criminals, such as Yama. It is named after the minimal chances of people getting out of the alley, alive.
Role in the CrossoverEdit
As the home city to the Big Hero 6, San Fransokyo plays a big part in the fandom when they are involved (as well as any AUs that involve superheroes or the Marvel Universe). As it takes place in modern times, San Fransokyo may exist at the same time as Burgess and Hotel Transylvania.