United States is about 6,365 times bigger than Oahu.

Oahu is approximately 1,545 km² (597 sq mi), while United States is approximately 9,833,517 sq km, making United States 636,374% larger than Oahu.
Tip: This to-scale comparison of Oahu vs. United States 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.