The one in the first picture is probably either an Australorp or a Jersey Giant (check color of bottom of feet. Yellow = JG, pink = 'Lorp.)
The barred one may be a Barred Rock or a Dominique or a Cuckoo Marans (or possibly something else) but we need comb and leg pictures for that one.
The red and white in front looks like a cross, so likely an Easter Egger, as already stated. Would like comb and leg pics. (EDT: Where did you get him? If not from a feed store, he could be a mix.)
I couldn't begin to guess on the others, so leg/comb pics would be really nice.