Feed store chicks - what am I?

[HorseGirlAbby]

Update #1 chick number 3 is coming in barred so has me thinking barred rock. Number 4 still has me stumped, I've attached a photo, im thinking some kind of maran? What do you think?

It could be a blue copper maran, or a blue Australorp or blue Andalusian. It’s tough to tell at this age, you’ll have to wait until it grows up more.

 

[my spoiled chickens]

#3 has a white spot on their head which makes me think barred rock

 

[MrsPerrywinkle]

#3 Has me leaning Barred Rock or Cuckoo Marans from the first few pictures. #4 looks like possibly Black Australorp?