Ho Chi Minh City is about 68 times bigger than Lisbon.

Lisbon (map shows its 24 named neighbourhoods; the area covers the whole city) is approximately 100 sq km, while Ho Chi Minh City is approximately 6,773 sq km, making Ho Chi Minh City 6,669% larger than Lisbon.
Tip: This to-scale comparison of Lisbon 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.