Atlanta is about 3.2 times bigger than South Bend.

South Bend (map shows its 30 named neighbourhoods; the area covers the whole city) is approximately 109 sq km, while Atlanta (map shows its 114 named neighbourhoods; the area covers the whole city) is approximately 350 sq km, making Atlanta 223% larger than South Bend.
Tip: This to-scale comparison of South Bend vs. Atlanta uses the Mercator projection, which distorts the size of regions near the poles.
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