China richest city is Beijing with a per capita GDP in 2017 of 20,356. China’s currency has strengthened by about 2% since the end of 2018. This puts Beijing at about the level of Portugal or Saudi Arabia with $20,575 and $20,957.
There are about 22 million people in Beijing and 25 million in Shanghai. Shanghai has per capita GDP in 2017 of $19,671.
Portugal has a population of 10.5 million.
Tianjin has a population of 15.5 million and a per capita GDP of $18,800.
Jiangsu has a population of 74 million and a per capita GDP of $16965.
The top four city/regions in China have a total population 135 million or more than the population of Japan.