Central Park is about 2.8 times smaller than Mackinac Island.

Mackinac Island is approximately 9.54 km² (3.68 sq mi), while Central Park is approximately 3.41 km² (1.32 sq mi), making Central Park 35.75% the size of Mackinac Island.
Tip: This to-scale comparison of Mackinac Island vs. Central Park uses the Mercator projection, which distorts the size of regions near the poles.
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