Although I've only weighed three of them, here are the definite weights, and approximate weights of mine:
Raleigh Pro - 22 lbs
Univega Activa Trail - 32 lbs unloaded (fenders/racks)
Western Flyer "3 speed" - 38 lbs
guessing:
UO8 - 28-32 lbs (depending on alloy or steel rims)
Raleigh Sports - ~40