Fastest-growing city

According to the United Nations' World Urban Prospects 2018, of the world's urban agglomerations with 300,000 inhabitants or more in 2018, the fastest growing city in the world is Rupganj, Bangladesh, which is expected to see a 9.35% increase for the period 2015–2020.

Rupganj is a settlement to the east of Dhaka whose population is being boosted by the construction of two "new cities" (called Jolshiri Abashon and Purbachal New Town) partially within Rupganj's current boundaries. The other fast-growing cities are all planned administrative centres. The newly built capital of Myanmar, Nay Pyi Taw, is in third place (9.14% growth); the Chinese administrative centre of Xiong'an (aka the Xiong'an New Area) – which has been built to allow the relocation of many functions of the Chinese government away from the crowded capital, Beijing - is in fourth (8.91% growth); and Gwagwalada, Nigeria (home to a new expansion of the Nigerian administrative capital, Abuja) is in fifth (8.55% growth).

The Syrian city of Aleppo is estimated to have the highest rate of growth (13.43%, caused by civilians returning to the city after the conclusion of the Battle of Aleppo). As no solid data has been collected in that country for almost a decade, however, the uncertainty surrounding this figure is too high for consideration.