Rome is about 10 times bigger than Anaheim.

Anaheim is approximately 130 sq km, while Rome is approximately 1,287 sq km, making Rome 889% larger than Anaheim.
Tip: This to-scale comparison of Anaheim vs. Rome 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.