Scottsdale is about 14 times smaller than Ho Chi Minh City.

Ho Chi Minh City is approximately 6,773 sq km, while Scottsdale is approximately 477 sq km, making Scottsdale 7.04% the size of Ho Chi Minh City.
Tip: This to-scale comparison of Ho Chi Minh City vs. Scottsdale uses the Mercator projection, which distorts the size of regions near the poles.
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