Atlanta is about 5 times bigger than Winterthur.

Winterthur is approximately 68 sq km, while Atlanta (map shows its 114 named neighbourhoods; the area covers the whole city) is approximately 350 sq km, making Atlanta 415% larger than Winterthur.
Tip: This to-scale comparison of Winterthur vs. Atlanta uses the Mercator projection, which distorts the size of regions near the poles.
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