Sydney is about 4.1 times smaller than South Bend.

South Bend (map shows its 30 named neighbourhoods; the area covers the whole city) is approximately 109 sq km, while Sydney is approximately 27 sq km, making Sydney 24.61% the size of South Bend.
Tip: This to-scale comparison of South Bend vs. Sydney uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.