Million plus cities

I was looking at a historical atlas the other day which gave a map of the world with cities over 1million population. It is commonly held that London was the first city to get to 1million, however this would not appear to be true. This post tries to find the order which cities reached 1milion population up to 1900.

My take on this is:

City Year  Beijing 1775 London 1800 Paris 1835 Manchester 1850 Wuhan 1850 New York 1870 Vienna 1875 Berlin 1875 St Petersburg 1875 Shanghai 1880 Tokyo 1885 Chicago 1890 Philadelphia 1890 Moscow 1897 Istanbul 1900

There's a raft of contradictory information out there - initial sources are:
http://www.census.gov/population/www/documentation/twps0027/twps0027.html
http://en.wikipedia.org/wiki/Historical_urban_community_sizes
https://faculty.washington.edu/modelski/WcitiesH.htm
http://www.odi.org.uk/events/docs/1125.pdf

http://geography.about.com/library/weekly/aa011201a.htm
http://en.wikipedia.org/wiki/List_of_largest_cities_throughout_history


It would seem also that there may have been cities greater than 1 million earlier, but the lack of census makes these estimates.

Potentially populations over 1 million (which were then not over 1 million by 1900):

Alexandria - 100BC
Rome - 0AD to 300 AD
Chang'an 700AD to 800 AD
Baghdad 925AD to 1200AD
Kaifeng 1200AD
Hangzhou 1200AD
Nanjing 1400AD

p.s. a proper list here that I've had to make myself, rather than find one that someone else has done and repeat. Hooray!