Currently we have 20. We have three coops total (only using one now). Normally we have two coops with chickens, one with ducks. We have much more demand for our eggs than we can fulfill right now. We get about a dozen & a half per day. If you are planning on selling eggs, one of the things my customers love is getting multi colored eggs (blue, white, light brown, dark brown), especially those who have kids. We also have a greenhouse & sell veggie plants in the spring and fresh veggies & berries throughout the summer. I'd plan the size of your coop based on the number of eggs you'd like to get per day, and size your coop accordingly.