Population size of Ancient Germanic Tribes

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Estimates of population size for Ancient Germanic barbarians:

Germany within present-day borders (source: McEvedy and Jones):

Year 700 BC - 1 milion (density 2.8 persons per 1 km2)
Year 50 AD - 3 million (density 8.4 persons per 1 km2)

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Ancient Scandinavia (until the birth of Jesus):

Around year 500 BC (source: McEvedy and Jones):

Denmark - 100,000 (density 2.5 per 1 km2)
Sweden and Norway - 50,000

Around year 200 BC (source: McEvedy and Jones):

Denmark - 200,000 (density 5 per 1 km2)
Sweden and Norway - 200,000

Around year 1 AD (source: Angus Maddison):

Denmark - 180,000
Sweden - 200,000
Norway - 100,000

 

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Demographic potential of "Germania" back in the 1st century AD was much smaller than that of the Roman Empire.

 

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Wolfram and Drinkwater both estimated the biggest Germanic tribes had a maximum of 100,000 members at any one time during the Roman Empire. This used some of the Roman accounts for war host numbers and assumed four dependants for each warrior. Malcolm Todd estimated extremely rough minimum population numbers in 6 AD of 1 million and maximum numbers in 300 AD of 3 million.

Another author who estimated the size of Germanic tribes is Ludwik Krzywicki, see below (in English):

https://babel.hathitrust.org/cgi/pt?id=uc1.b4381154;view=1up;seq=96

^^^
I think that there is more info about Germanic (and also Slavic) tribes in the Polish edition. I'll check later.

Polish historian Adam Sengebusch estimates the population of late 4th century AD (late 300s) Poland as around 600,000 people. After the Hunnic invasion and shortly before Slavic Migrations, he estimates ca. 150,000 to 250,000 people in Poland.

Kazimierz Godłowski also estimated that population of Poland declined by 2/3 during that period.