London is about 8 times bigger than Baltimore.

Baltimore is approximately 210 sq km, while London (including the 32 boroughs of greater London) is approximately 1,572 sq km, making London 650% larger than Baltimore.
Tip: This to-scale comparison of Baltimore vs. London 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.