Copper Maran: Comb looks sort of pink but isn't as big as a male's should be. Could have been hot & "she's" flushed.... or "he" could be a late bloomer.
Olive-Egger: Female.... and a pretty one too! Looks like she came from a Crested Cream Legbar to get the blue-green egg color genes.
Rhode Island Red: Female
Silver Laced Wyandotte: Female (can tell by 2nd pic)
Blue-laced Wyandotte: Female - pretty one too
Ameracauna: I can't see the comb well enough to be sure. Feathers & body look female, though.