El Salvador is about 170 times bigger than Boston.

Boston is approximately 124 sq km, while El Salvador is approximately 21,041 sq km, making El Salvador 16,869% larger than Boston.
Tip: This to-scale comparison of Boston vs. El Salvador 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.