Where I am from or where I live? Where I am from is the metro DC area, and a huge percentage of people there are from out of town LOL. Politicians, diplomats, immigrants, Navy and other branches of service, it is so commonplace to not be from Maryland, Virginia, or DC. I actually grew up on the MD side of town, and Marylanders do have a specific accent in the area (southern Maryland actually sounds very southern) but it is still hard to pick up major accent difference between MD and most of the northeast and eastern parts of the midwest. But, if someone with a big southern, midwest, or new england accent shows up, you know they did not grow up there. But, they might have been living there for many years.
Where I live now, outside of Memphis, TN, if someone looks foreign they probably were not born here. Memphis seems to only recently be getting immigrants from Latin America and Asia. Accent also gives people away. There is not a very strong southern accent here, people with southern accents I have to ask if they are from here or not. Accents from other areas of the country give people away. Also, if they are white and democrats I assume they are not from here originally, but that is not always the case, but the majority of the time it is.
Oh, women’s hair cuts coupled with other traits sometimes give away what part of the country a person is from. TN does a lot of that inside out mullet. You know, short in the back and long in the front.