While states themselves have "sister state" partnerships, global municipal relationships are maintained through Oklahoma's major cities.
* **State of Oklahoma Sister Regions**: Kyoto Prefecture (Japan), Gansu Province (China), and Taiwan. * **Oklahoma City Sister Cities**: Taipei (Taiwan), Kigali (Rwanda), Puebla (Mexico), Rio de Janeiro (Brazil), and Piura (Peru). * **Tulsa Sister Cities**: Amiens (France), Celle (Germany), Utsunomiya (Japan), and Tiberias (Israel).