Founded by President Dwight D. Eisenhower in 1956, Sister Cities International (SCI) is a 501(c)(3) non-profit that serves as the national membership organization for individual sister cities, countries and states across the United States. This network unites tens of thousands of citizen diplomats and volunteers in over 500 members communities, with more than 2,000 partnerships in 145 countries on six continents. SCI provides essential services, programs and resources to help member cities find partners and expand and improve their activities. Membership gives cities access to unique tools and dedicated staff guidance to build grow and maintain successful relationships.