Little Rock is about 11 times smaller than Hanoi.

Hanoi is approximately 3,360 sq km, while Little Rock (map shows its 28 named neighbourhoods; the area covers the whole city) is approximately 314 sq km, making Little Rock 9.35% the size of Hanoi.
Tip: This to-scale comparison of Hanoi vs. Little Rock 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.