Hi Paula,
My husband had his biometrics in Atlanta, but his naturalization interview and oath ceremony were both in Montgomery, AL. I'm not sure why they had him go to Atlanta for his biometrics originally, but the field office he is zoned for is Montgomery.
His oath was held on Jan 26.
I do know that Atlanta tends to be a busier field office so that could be the reason for the delay, but if you can contact the local field office, you should do so. On the documents you were given during the interview there should be a name of a field officer you can contact.