Vientiane is the capital and largest city. Further large cities are Luang Prabang, Savannakhet and Pakse. What is the capital of Laos, what is the population of Laos, what currency is used in Laos, what are the main cities? Lao Lao Lao Country Code, capital, regions, wiki. The Vientiane, meaning "Sandalwood City", is located on the banks of the Mekong River near the Thai border and is proud of its Buddhist temples and French colonial architecture scattered throughout the city.