Ho Chi Minh City is about 11 times bigger than Tucson.

Tucson (map shows its 130 named neighbourhoods; the area covers the whole city) is approximately 627 sq km, while Ho Chi Minh City is approximately 6,773 sq km, making Ho Chi Minh City 980% larger than Tucson.
Tip: This to-scale comparison of Tucson vs. Ho Chi Minh City uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.