Hampton Inn is owned by Hilton, Hotels Worldwide. They do not have an official corporate headquarters. So, if you are interested in writing a letter or calling Hampton Inn, you will need to refer to the address below for Hilton.
Feedback hotline: 1-800-HAMPTON (24/7 customer service)
Hamptom Inn (Hilton) Worldwide Headquarters
Address: 7930 Jones Branch Drive
City, ST: McLean, Virginia 22102
Phone number: 1 (703) 883 1000
Hampton Inn (Hilton) Asia Office
Corporate alias: Vision Crest Commercial
Address: 103 Penang Road #09-01/07
Country: Singapore 238467
Phone number: +65 6833 9888
USA Hotel Operations Headquarters
Address: 755 Crossover Lane
City, ST: Memphis, TN 38117
Phone number: 1 (901) 374 5000
Middle East Office
Address: Dubai Internet City, Building 15, Office 101-111, P.O. Box 500200
Country: Dubai, U.A.E
Phone number: +971 4 391 5100
European Office
Address: Maple Court, Central Park, Reeds Crescent
City: Watford, WD24 4QQ
Country: United Kingdom
Phone number: +44 207 856 8000
Blog 
Write for Us