Here are the most popular small-flock "breeds" (some aren't actually breeds) as determined by my unscientific survey. I can't guarantee that the order of popularity is correct, but I can guarantee that the 10 most popular small-flock chicken breeds in North America are on this list.
1. Plymouth Rock
http://en.wikipedia.org/wiki/Plymouth_Rock_(chicken)
http://www.mypetchicken.com/chicken-breeds/Plymouth-Rock-B85.aspx
https://www.backyardchickens.com/products/plymouth-rock
2. Rhode Island Red
http://en.wikipedia.org/wiki/Rhode_Island_Red
http://www.mypetchicken.com/chicken-breeds/Rhode-Island-B97.aspx
https://www.backyardchickens.com/products/rhode-island
3. "Easter Egger"
http://www.mypetchicken.com/catalog/Day-Old-Baby-Chicks/Easter-Egger-p246.aspx
http://en.wikipedia.org/wiki/Easter_Egger
https://www.backyardchickens.com/products/easter-eggers
4. Australorp
http://www.mypetchicken.com/chicken-breeds/Australorp-B14.aspx
http://en.wikipedia.org/wiki/Australorp
https://www.backyardchickens.com/products/australorp
5. Leghorn
http://www.mypetchicken.com/chicken-breeds/Leghorn-White-B65.aspx
http://www.mypetchicken.com/chicken-breeds/Leghorn-Non-White-B66.aspx
http://en.wikipedia.org/wiki/Leghorn_(chicken)
https://www.backyardchickens.com/products/leghorn
6. Orpington
http://en.wikipedia.org/wiki/Orpington_(chicken)
http://www.mypetchicken.com/chicken-breeds/Orpington-B80.aspx
https://www.backyardchickens.com/products/orpington
7. New Hampshire
http://en.wikipedia.org/wiki/New_Hampshire_(chicken)
https://www.backyardchickens.com/products/new-hampshire-red
http://www.mypetchicken.com/chicken-breeds/New-Hampshire-Red-B76.aspx
8. Red Sex-Link (Red Star, Golden Comet)
http://en.wikipedia.org/wiki/Sex_link
http://www.mypetchicken.com/catalog/Day-Old-Baby-Chicks/Red-Star-p224.aspx
https://www.backyardchickens.com/products/star
9. Black Sex-Link (Black Star)
http://en.wikipedia.org/wiki/Sex_link
https://www.backyardchickens.com/products/star
10. Wyandotte
http://en.wikipedia.org/wiki/Wyandotte_(chicken)
http://www.mypetchicken.com/chicken-breeds/Wyandotte-B6.aspx
https://www.backyardchickens.com/a/wyandottes-chicken-breed-page
11. Welsummer
http://www.mypetchicken.com/chicken-breeds/Welsummer-B108.aspx
http://en.wikipedia.org/wiki/Welsummer
https://www.backyardchickens.com/products/welsummer
12. Cochin
http://en.wikipedia.org/wiki/Cochin_(chicken)
http://www.mypetchicken.com/chicken-breeds/Cochin-B30.aspx
https://www.backyardchickens.com/products/cochin
13. Old English Game
http://en.wikipedia.org/wiki/Old_English_Game
http://www.feathersite.com/Poultry/Games/GameBantams/BRKOEGBantams.html
https://www.backyardchickens.com/products/old-english-game
14. Silkies
http://en.wikipedia.org/wiki/Silkie
http://www.mypetchicken.com/chicken-breeds/Silkie-Bantam-B100.aspx
https://www.backyardchickens.com/products/silkie
15. Jersey Giant
http://en.wikipedia.org/wiki/Jersey_Giant
http://www.mypetchicken.com/chicken-breeds/Jersey-Giant-B57.aspx
https://www.backyardchickens.com/products/jersey-giant
16. Polish
http://en.wikipedia.org/wiki/Polish_(chicken)
http://www.mypetchicken.com/chicken-breeds/Polish-B91.aspx
https://www.backyardchickens.com/products/polish
1. Plymouth Rock
http://en.wikipedia.org/wiki/Plymouth_Rock_(chicken)
http://www.mypetchicken.com/chicken-breeds/Plymouth-Rock-B85.aspx
https://www.backyardchickens.com/products/plymouth-rock
2. Rhode Island Red
http://en.wikipedia.org/wiki/Rhode_Island_Red
http://www.mypetchicken.com/chicken-breeds/Rhode-Island-B97.aspx
https://www.backyardchickens.com/products/rhode-island
3. "Easter Egger"
http://www.mypetchicken.com/catalog/Day-Old-Baby-Chicks/Easter-Egger-p246.aspx
http://en.wikipedia.org/wiki/Easter_Egger
https://www.backyardchickens.com/products/easter-eggers
4. Australorp
http://www.mypetchicken.com/chicken-breeds/Australorp-B14.aspx
http://en.wikipedia.org/wiki/Australorp
https://www.backyardchickens.com/products/australorp
5. Leghorn
http://www.mypetchicken.com/chicken-breeds/Leghorn-White-B65.aspx
http://www.mypetchicken.com/chicken-breeds/Leghorn-Non-White-B66.aspx
http://en.wikipedia.org/wiki/Leghorn_(chicken)
https://www.backyardchickens.com/products/leghorn
6. Orpington
http://en.wikipedia.org/wiki/Orpington_(chicken)
http://www.mypetchicken.com/chicken-breeds/Orpington-B80.aspx
https://www.backyardchickens.com/products/orpington
7. New Hampshire
http://en.wikipedia.org/wiki/New_Hampshire_(chicken)
https://www.backyardchickens.com/products/new-hampshire-red
http://www.mypetchicken.com/chicken-breeds/New-Hampshire-Red-B76.aspx
8. Red Sex-Link (Red Star, Golden Comet)
http://en.wikipedia.org/wiki/Sex_link
http://www.mypetchicken.com/catalog/Day-Old-Baby-Chicks/Red-Star-p224.aspx
https://www.backyardchickens.com/products/star
9. Black Sex-Link (Black Star)
http://en.wikipedia.org/wiki/Sex_link
https://www.backyardchickens.com/products/star
10. Wyandotte
http://en.wikipedia.org/wiki/Wyandotte_(chicken)
http://www.mypetchicken.com/chicken-breeds/Wyandotte-B6.aspx
https://www.backyardchickens.com/a/wyandottes-chicken-breed-page
11. Welsummer
http://www.mypetchicken.com/chicken-breeds/Welsummer-B108.aspx
http://en.wikipedia.org/wiki/Welsummer
https://www.backyardchickens.com/products/welsummer
12. Cochin
http://en.wikipedia.org/wiki/Cochin_(chicken)
http://www.mypetchicken.com/chicken-breeds/Cochin-B30.aspx
https://www.backyardchickens.com/products/cochin
13. Old English Game
http://en.wikipedia.org/wiki/Old_English_Game
http://www.feathersite.com/Poultry/Games/GameBantams/BRKOEGBantams.html
https://www.backyardchickens.com/products/old-english-game
14. Silkies
http://en.wikipedia.org/wiki/Silkie
http://www.mypetchicken.com/chicken-breeds/Silkie-Bantam-B100.aspx
https://www.backyardchickens.com/products/silkie
15. Jersey Giant
http://en.wikipedia.org/wiki/Jersey_Giant
http://www.mypetchicken.com/chicken-breeds/Jersey-Giant-B57.aspx
https://www.backyardchickens.com/products/jersey-giant
16. Polish
http://en.wikipedia.org/wiki/Polish_(chicken)
http://www.mypetchicken.com/chicken-breeds/Polish-B91.aspx
https://www.backyardchickens.com/products/polish
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