The black one looks like a Cayuga. The one in the back with the strips over eyes looks like a Rouen. The mixed color ones could be Ancona or Magpie. Could you get more pictures of those two from different angles?
Striped one is a rouen
Black is likely a cayuga. Could be a black runner (if it stands upright a lot)
The other two look to be magpies based on the solid back and cap
I'm glad that someone posted and asked about their breeds. I believe I have one crested pekin, one magpie and one Cayuga. I was trying to figure out which the black and yellow duck is. Mystery solved: now I just need to know the genders.