Jersey City is about 32 times smaller than Los Angeles.

Los Angeles (including the city proper only) is approximately 1,215 sq km, while Jersey City (map shows its 11 named neighbourhoods; the area covers the whole city) is approximately 38 sq km, making Jersey City 3.14% the size of Los Angeles.
Tip: This to-scale comparison of Los Angeles vs. Jersey City 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.