Ngerulmud is the only settlement in Palau to have its own ZIP code (96939), with the rest of the country using 96940 – the United States Postal Service services Palau as part of the Compact of Free Association with the United States.
Ngerulmud er den eneste bebyggelse i Palau, der har sit eget postnummer (96939), hvor resten af landet bruger 96940 – United States Postal Service servicere Palau som en del af Compact of Free Association med Usa.