Sister Cityback (date of affiliation)   Friendship & Cooperation Cityback (date of affiliation)
Seattle (USA) October 21, 1957   Philadelphia (USA) October 17, 1986
Marseilles (France) July 2, 1961      
Rio de Janeiro (Brazil) May 19, 1969   Sister Portsback (date of affiliation)
Riga (Latvia) June 18, 1974   Port of Seattle (USA) May 15, 1967
Brisbane (Australia) July 16, 1985   Port of Rotterdam (The Netherlands) May 15, 1967
Barcelona (Spain) April 6, 1993
     
      Friendly Portback (date of affiliation)
Friendly Cityback (date of affiliation)
  Port of Tianjin (China) August 26, 1980
Tianjin (China) June 24, 1973      
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