Atlanta is about 11 times smaller than Melbourne.

Melbourne (the 27 councils of metropolitan Melbourne, without the Yarra Ranges, Cardinia, Mornington Peninsula and Nillumbik) is approximately 3,915 sq km, while Atlanta (map shows its 114 named neighbourhoods; the area covers the whole city) is approximately 350 sq km, making Atlanta 8.95% the size of Melbourne.
Tip: This to-scale comparison of Melbourne vs. Atlanta uses the Mercator projection, which distorts the size of regions near the poles.
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