Upvote:6
It is worth noting that during the Second Polish Republic, Vilno and Lvov were the third and sixth largest cities in the country, with between 200,000-300,000 people. GdaΕsk, Szczecin, and WrocΕaw had much smaller (Polish) populations before the war, so it didn't take much to "repopulate" the Polish populations of those cities (low tens of thousands). They had the advantage of being able to occupy formerly German homes.
For comparison purposes, Gdynia had about 120,000 and Thorn 60,000 in 1938, both of which were decidedly smaller than Lvov and Vilno. (The first two were Polish cities with larger Polish populations than the three repopulated cities.)
And Warsaw was Warsaw. Even if "decimated" meant losing 60%+ of its prewar population (the one third Jewish part and a comparable number of Poles), what was left (300,000-400,000) would be sufficient to repopulate it, because it was still Poland's largest city by population.