District of Columbia is about 1.2 times smaller than Lake of the Ozarks.

Lake of the Ozarks is approximately 212 km² (82 sq mi), while District of Columbia is approximately 177 sq km, making District of Columbia 83.61% the size of Lake of the Ozarks.
Tip: This to-scale comparison of Lake of the Ozarks vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.
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