What comes to mind for me is Zodiac by Neal Stephenson. I had no idea Stephenson had ever lived in Boston when I first read it, but it dawned on during the first chaper. Not in a questioning, "huh, did he ever live here?" way, but as fact: "I didn't realize Neal Stephenson had lived in Boston. Huh."
Have you read something that made you realize the writer had lived in the place where it was set?
Any thoughts on what it is about the writing that can make this so evident?