Sydney is about 3.3 times smaller than Connecticut.

Connecticut is approximately 12,548 sq km, while Sydney (the 30 councils of metropolitan Sydney, without the Blue Mountains, Hawkesbury, Wollondilly and the Central Coast) is approximately 3,810 sq km, making Sydney 30.36% the size of Connecticut.
Tip: This to-scale comparison of Connecticut vs. Sydney uses the Mercator projection, which distorts the size of regions near the poles.
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