Atlanta is about 1.8 times smaller than Tucson.

Tucson (map shows its 130 named neighbourhoods; the area covers the whole city) is approximately 627 sq km, while Atlanta (map shows its 114 named neighbourhoods; the area covers the whole city) is approximately 350 sq km, making Atlanta 55.87% the size of Tucson.
Tip: This to-scale comparison of Tucson vs. Atlanta uses the Mercator projection, which distorts the size of regions near the poles.
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