Our Sister Cities For over 60 years San Diego been part of Sister Cities International and has always strived to create peace and understanding. Currently San Diego has 16 different Sister Cities though we are always growing. Alcalá de Henares Spain (Est. 1982) Campinas Brazil (Est. 1995) Cavite Philippines (Est. 1969) Edinburgh Scotland (Est. 1977) Jalalabad Afghanistan (Est. 2004) Jeonju South Korea (Est. 1983) León Mexico (Est. 1969) Panama City Panama (Est. 2015) Perth Australia (Est. 1986) Taichung Taiwan (EST. 1983) Tema Ghana (EST. 1976) Tijuana Mexico (Est. 1993) Vladivostok Russia (Est. 1991) Warsaw Poland (Est. 1996) Yantai China (EST. 1985) Yokohama Japan (Est. 1957)