Source Data Reference for:

City = Philadelphia
Time = 1800

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Philadelphia	1775	34,000			Tertius Chandler	Four thousand years of urban growth	p52
Philadelphia	1800	68,000			Tertius Chandler	Four thousand years of urban growth	"p43, p54"
Philadelphia	1800	68,000			Tertius Chandler	Four thousand years of urban growth	p529
Philadelphia	1800	68,000			Tertius Chandler	Four thousand years of urban growth	p540
Philadelphia	1800	41,200			Jan Lahmeyer	http://www.populstat.info/	n/a
Philadelphia	1800	68,000			Tertius Chandler	Four thousand years of urban growth	p486
Philadelphia	1811	100,000	passed for the 1st time		Tertius Chandler	Four thousand years of urban growth	p542