Los Angeles is about 35 times bigger than Rockville.

Rockville (map shows its 87 named neighbourhoods; the area covers the whole city) is approximately 35 sq km, while Los Angeles (including the city proper only) is approximately 1,215 sq km, making Los Angeles 3,357% larger than Rockville.
Tip: This to-scale comparison of Rockville vs. Los Angeles 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.