1, 2009) [1]  - Total 7,123,340   -  Density 8,805/sq mi (3,401/km 2 ) Area code(s) +84 (8) Sài Gòn  is the largest  city  in  Vietnam . It was once known as  Prey Nokor , an important Khmer seaport prior to annexation by the Vietnamese in the 17th century. It was