Hi and Welcome to BYC! The white chicken standing closest to the waterer looks like a Leghorn. The other white chicken looks like it has some coloring on the breast so is probably a mixed breed. The black with brown feathers also look like mixes. The reddish one could be any of several breeds, but is most likely a production red.
To get a specific id, it's helpful to have a close up of the head showing the comb and also a pic that shows the legs and feet.
Knowing the age will help with sexing. I would guess that the two white and the red chickens are pullets. Can't tell with the black ones.
Hopefully, someone will have more answers for you.