Rome is about 6 times bigger than Oakland.

Oakland (map shows its 131 named neighbourhoods; the area covers the whole city) is approximately 202 sq km, while Rome is approximately 1,287 sq km, making Rome 537% larger than Oakland.
Tip: This to-scale comparison of Oakland 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.