Where in Atlanta do you live? Where about in Atlanta do you live? -- No grammar problem, but about could be omitted. The phrase means something like this: Where [about the area] in Atlanta do you live? -- The word about is okay, but not needed.
Consider the word whereabouts. Do you know her whereabouts? No. I do not know where she is.
This has the same meaning as: Do you know where she is? No. I do not know where she is.