Driving Directions for ALLIANT DataTel, Inc. - US Headquarters   Atlanta, GA - Northpark Center 1200 Abernathy Road Northpark Town Center Suite 1700 Atlanta, Georgia 30328 United States By Road : FROM HARTSFIELD ATLANTA INTERNATIONAL AIRPORT Take I-85 North to GA 400 North to exit 5A-Dunwoody. Continue right off exit and at the 2nd light turn left onto Peachtree Dunwoody Rd. Turn right at the first drive into Northpark Town Center.