Source Data Reference for:

City = Kaliningrad
Time = 1850

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Kaliningrad	1850	76,000			Paul Bairoch	La population des villes europeennes de 800 a 1850
Konigsberg	1850	76,000			Tertius Chandler	Four thousand years of urban growth	p24
Kaliningrad	1858	81,800			n/a	Gothaischer Hofkalender
Konigsberg	1866	100,000	passed for the 1st time		Tertius Chandler	Four thousand years of urban growth	p542