[@Rare] I've been doing improved research and this is what I have for 6 out of 6 provinces so far:

[b]Provinces with my updated population estimate:[/b]
Jiangsu = 26,172,048 million.
Ningxia = 1,210,000 million.
Quangdong = 25,696,400 million. (Including Hainan island) 
Qinghai = 943,000 thousand.
Jilin = 9,350,000 million.
Hainan Island = Impossible for me to do, no census has been taken since 1982 because that is when the island became its seperate province. I can only estimate it at around 3,750,000 to 4,250,000 million, for just the island. But I believe Lennon has some land from mainland China to his territory as well, which only complicates my task.