I'm having trouble seeing some of the combs (chickens love to twitch their head just as the camera clicks!) Combs can be quite useful for sorting out chicken breeds. Single comb looks the right shape to comb your hair with, rose comb is lower, wider, and sort-of flat on top; it often has a rough-looking texture.
First photo, Barred Rock in front. Blue Laced Red [something] behind her (Wyandotte if she has a rose comb.)
Second photo, Barred Rock in the middle. Left is probably Barred Rock, but chance of Dominique (if rose comb.) Rightmost is likely Black Australorp.
Third photo, Partridge [something]--probably Rock or Wyandotte, depending on the comb. (Rock has a single comb, Wyandotte has a rose comb.)
Fourth photo, I think I see two Barred Rocks. (The light one has me slightly puzzled, but I can't think of anything else she could be.)
Note, if any of the "Barred Rocks" have feathers on their feet, they are probably Cuckoo Marans instead.