Guangdong
Guangdong (; formerly romanised as Kwangtung or Canton Province) is a province in South China, on the South China Sea coast. Guangdong surpassed Henan and Shandong to become the most populous province in China in January 2005, registering 79.1 million permanent residents and 31 million migrants who lived in the province for at least six months of the year; the total population was 104,303,132 in the 2010 census, accounting for 7.79 percent of Mainland China's population. This also makes it the most populous first-level administrative subdivision of any country outside of South Asia, as its population is surpassed only by those of the Pakistani province of Punjab and the Indian states of Bihar, Maharashtra and Uttar Pradesh. The provincial capital Guangzhou and economic hub Shenzhen are among the most populous and important cities in China. The population increase since the census has been modest, the province registering 108,500,000 people in 2015.
Chinese city tier system
It is important to note that a "city" in China may refer to an administrative unit at different levels. In short, while there are 334 prefectural-level units in China, there are 2,851 units at the county level, and 39,864 units at the township level. This list includes only units at the prefectural level, the second highest administrative division in China. A "prefectural-level" administrative unit can be a city, a prefecture, an autonomous prefecture, and a league. The four direct municipalities, Beijing, Shanghai, Chongqing, and Tianjin are also considered cities even though they are officially provincial-level administrative units. It is for these reasons that "Yicai Global"'s published list includes 338 "cities": namely all of the 334 prefectural-level units plus the 4 direct municipalities.
An unofficial list published by the "South China Morning Post" ranks 613 Chinese cities on four tiers. This list uses a variety of parameters as the basis of classification: population size, GDP, and administrative hierarchy. According to the "South China Morning Post", the Tier 1 Chinese cities consist of Beijing, Shanghai, Guangzhou, Tianjin, and Chongqing.