I think I have about 80 sims in my households, even though I don't play all of them. I might like to reduce the number a bit and also maybe have about 10 households that I actively play, so that I could focus on them better, but it's a slow process.
I didn't count the "other households" in my answer, sorry. I'm not sure how many there are... maybe under 100 because every now and then I delete some of them just to make sure that the game doesn't delete the ones I want to keep, and I guess I also like to see what kind of townies there are and whether I would like to move some of them to my households.
