ɪn nˈaɪntiːnhˈʌndɹɪd twˈɛnti pˈiː ænd ˈoʊ bˈæŋk ɪstˈæblɪʃt ɐ bɹˈæntʃ ɪn kəlˈɑːmboʊ, seɪlˈɑːn, wˌɪtʃ ɪt fˈɑːloʊd baɪ ɪstˈæblɪʃɪŋ bɹˈæntʃᵻz ɪn ʃæŋhˈaɪ, hˈɑːŋ kˈɑːŋ, sˈɪŋɡɐpˌoːɹ, ænd kˈæntɑːn.
In 1920 P&O Bank established a branch in Colombo, Ceylon, which it followed by establishing branches in Shanghai, Hong Kong, Singapore, and Canton.