Iowa is about 38 times bigger than Sydney.

Sydney (the 30 councils of metropolitan Sydney, without the Blue Mountains, Hawkesbury, Wollondilly and the Central Coast) is approximately 3,810 sq km, while Iowa is approximately 144,701 sq km, making Iowa 3,698% larger than Sydney.
Tip: This to-scale comparison of Sydney vs. Iowa 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.