Disneyland is about 17 times smaller than Mackinac Island.

Mackinac Island is approximately 9.54 km² (3.68 sq mi), while Disneyland is approximately 0.55 km² (0.21 sq mi), making Disneyland 5.8% the size of Mackinac Island.
Tip: This to-scale comparison of Mackinac Island vs. Disneyland uses the Mercator projection, which distorts the size of regions near the poles.
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