What is the width of north America in kilometers?

Answer 1

Using two different maps and the scale of distance on the maps, a horizontal line from the Oregon coast to the Boston coast measures 2,820 miles according to one map, and 2,685 according to the second map. So, I would estimate the distance from the Oregon coast to the Boston coast is around 2,750 miles.

If you measure directly east-west along a line of latitude, then I get:

for 40 deg N, which runs from CA to NJ, and spans 50 deg of longitude, that covers 4264 km, assuming that the Earth's radius is 6378 km.

On the other hand, at 47 deg N, which runs from WA to ME and spans 56.4 deg, that covers 4284 km. Both are pretty close, and equal about 2650 miles.