The Gambia has reciprocal arrangements with many countries, either on bilateral agreements or through membership of certain organizations, whereby citizens of those countries do not require a visa for a period of stay of less than three months. These include the member countries of ECOWAS, all Commonwealth countries, all European Union Countries.
Nationals of other countries should apply for a visa to a Gambian diplomatic mission or consulate abroad. A visa may also be obtained from British consular offices in countries where there is no Gambian diplomatic or consular representation.
Visas cost £40 or US$100. The price changes depending on where you apply from.
Visa Requirements for Gambia
Gambia embassy in the USA