Montserrat is about 135 times smaller than Montenegro.

Montenegro is approximately 13,812 sq km, while Montserrat is approximately 102 sq km, making Montserrat 0.74% the size of Montenegro. Meanwhile, the population of Montenegro is ~604,966 people (599,552 fewer people live in Montserrat).
Tip: This to-scale comparison of Montenegro vs. Montserrat 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.