Thanks for the ideas. The bikes both pull even if I'm not pedaling, and if I go to the other side of the road where the crown should cause them to pull to the left. One bike has a dropout that will cause the rear wheel to be crooked if I don't pay close attention. But it's straight now and still pulling. I think the headsets may be where I need to look. One bike has "indexed steering" - a slight bump you can feel when you steer the front wheel back and forth. I thought it was intentional when I got the bike. Does this mean the front wheel took a hit and it made an indention in the headset bearings?

It is interesting that both bikes seem to pull the same way. That makes me think it's something I'm doing. Can it be that I'm sitting crooked on the bike and don't realize it? I can ride no hands and turn corners with no hands. It just feels like I'm always having to compensate to the left.