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About Locations | ADTRAN's corporate headquarters is located in Huntsville, Alabama, in the second largest research park in the United States. We have engineering research and development centers in Phoenix, Arizona; Burlington, Massachusetts; Ottawa, Ontario, Canada; Hyderabad, India; Greifswald, Berlin, and Munich, Germany. Sales and support offices are located throughout the U.S. and around the world. |  |  |  |
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