Haikou is now Scottsdale's newest sister city. The mayors of the two cities signed a sister city agreement in Haikou on March 20, 2010.
Haikou is the capital of China's island province of Hainan. It is located just south of mainland China in the South China Sea. Scottsdale and Haikou have many similarities. Both have extensive resort, spa and golf properties, are premier tourism cities and are warm weather destinations for winter visitors. Haikou is Scottsdale's Gateway to China. The sister city relationship will be mutually beneficial to both cities with medical technology, educational, cultural and student exchanges under discussion.
海口，海南，中国
海口市是斯高岱最新建立的友好交流城市。2010年3月20日，斯高岱市长吉姆∙兰尼先生和海口市市长徐唐先先生共同签署了海口与斯高岱建立友好交流城市关系的正式协议书。两地在地域和经济等各方面的共性包括：都拥有温暖的四季；都是大批北方城市旅游者冬季首选的旅游胜地；完美的高尔夫球场及设施，五星级酒店，美容及各种 娱乐休闲设施；出色的城市设计和优秀的学校等等。
海口市是中国岛屿省份海南省的省会，位于中国大陆的南部。海口市将为斯高岱打开通往中国的大门。此次友好交流城市的建立，将加速两地在文化，教育，经济，医疗科技等各方面的交流，使双方获益。