Los Angeles is about 3.2 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 Los Angeles (including the city proper only) is approximately 1,215 sq km, making Los Angeles 31.03% the size of Melbourne.
Tip: This to-scale comparison of Melbourne vs. Los Angeles uses the Mercator projection, which distorts the size of regions near the poles.
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