South Bend is around the same size as San Francisco.

San Francisco (including the city proper only) is approximately 121 sq km, while South Bend (map shows its 30 named neighbourhoods; the area covers the whole city) is approximately 109 sq km, making South Bend 89.68% the size of San Francisco.
Tip: This to-scale comparison of San Francisco vs. South Bend uses the Mercator projection, which distorts the size of regions near the poles.
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