Sister Cities International (SCI) was founded by President Dwight D. Eisenhower in 1956, SCI is a nonpartisan 501(c)(3) nonprofit which serves as the national membership organization for individual sister cities, counties, and states across the United States. 

Representing over 500 U.S. cities with 2000 partnerships in 146 countries, Sister Cities International promotes peace through mutual respect, understanding and cooperation one
individual, one community at a time. For over six decades, we touch the everyday lives of millions of people through economic development projects, academic and scholarship opportunities, resilient cities initiatives and environmental programs, arts and cultural heritage activities as well as municipal, youth and sports exchanges.