Indianapolis is about 4.5 times bigger than Baltimore.

Baltimore is approximately 210 sq km, while Indianapolis is approximately 935 sq km, making Indianapolis 346% larger than Baltimore.
Tip: This to-scale comparison of Baltimore vs. Indianapolis 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.