Gambia Business Directory: GMB is the ISO 3 alphabet country code of Gambia. Currency of Gambia is D, which has a short code of GMD. Capital of Gambia is Banjul. Gambia has the population of 2163765 and approximate area is 11295.00 square kilometers (or approx. 7018.713 square miles). Population density of Gambia is approx. 191/Km2 (or approx. 118.6874/mile2)