I changed my apple password and still receiving notice that someone is using my apple id?

If this is an e-mail you received, or a popup on the screen,  about the time you were actually logging in, there is probably nothing to worry about. The location in the e-mail is where your ISP reported it. If their servers are in a location distant from you, there will be a large error. Based on other posts I have read, the distant error can be very large.

You can also add 2 Factor Authentication to your account for more security. If the attempts continue, you might want to consider a name change.

Link to contact Apple Support in the article.

Apple ID has been compromised.      

Security and your Apple ID.      

Note the restrictions in the article.

Apple ID Name Change.        

 What to do after you change your Apple ID or password - Apple Support    I suggest doing this before you change your Apple ID or password.

Apple ID -Two-factor authentication          

Two Factor Authentification availability.    

2 Factor Authentication - How to generate a recovery key

Apple ID - Using app-specific passwords.     

Apple ID - Two Step Verifications FAQ    

That is what I meant by your ISP being somewhere else. That is possible if that is where the AT&T servers are.

You are welcome.