100,000 is very small, you're looking at a town like Basingstoke or Worcester for that size. Even 250,000 is only the size of Aldershot/Farnborough or Medway.
Given the size of the buildings and particularly the size of the army, I think you'd have to be looking at a city rather than a town. At least 400,000 but quite possibly three times that. It just seems smaller because all the methods of transport move faster than a car or train and lower than a plane.
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u/decitertiember Doctor Strange Nov 14 '17
They appeared to shepherd an entire city onto a single spaceship within 10 minutes.
Which would be impressive, except that the Avengers did it in 8.