Here's the answer:
“出身は横浜です”
(shusshin wa yokohama desu)
Watch a real native speaker say it:
Here's how it sounds in a textbook:
You could also say:
- 私の出身は横浜です
- 私は横浜出身です
Fun fact: the hundreds of thousands of people learning Japanese with Memrise get this phrase correct 93.7% of the time!