Mute Swan

While I agree with Mute Swan, they are not the only swan in NJ; in recent years, Tundra Swan have increased their range and are now regular in your state. There are a few records in your county.

Forest is right, Cygnus olor is the only swan that inhabits NJ.

Though it's a bit hard to tell, I think these might be Cygnus olor, Mute Swans. See what you think:
http://en.wikipedia.org/wiki/Mute_Swan