Ho Chi Minh City is about 19 times bigger than Detroit.

Detroit (map shows its 92 named neighbourhoods; the area covers the whole city) is approximately 359 sq km, while Ho Chi Minh City is approximately 6,773 sq km, making Ho Chi Minh City 1,785% larger than Detroit.
Tip: This to-scale comparison of Detroit 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.