what part of japan does jimmy kudo from case closed live?

Answer 1

He lives in a Tokyo suburb, but it's a fictional one. The nearby train station is "Beika Station," and he lives in "Beika City."

There's no such city in Japan. The name is just an homage to Sir Arthur Conan Doyle. ("Beika" is the closest you can get to "Baker" in Japanese -- Sherlock Holmes lived on Baker Street.)