Hi Rex Mom,
I live in the city and bought some of the quietest ducks in the world recently: Hottentot Teals.
They are quieter than the doves that i feed around the house.
They only seem to make noise if they are startled, like when i am entering the aviary to feed them and i startle them by walking too close to them.
They are getting used to me, so they are hardly doing that, but if anyone else walks up to look at them from the outside and they get a little scared they make a very soft low-pitched whistle-blowing combined with the most whispering type quack i have ever herad noise. It's not high pitched but kinda like the sound a dove makes when it flies off, but much quieter. I honestly can't even describe it as a quack, because they make more noise flapping their wings than vocals.
I was worried to death about how loud they would be and i was worried for nothing. They are very small, too. Just barely larger than a well-fed dove.
Of course, if you want a duck that you would like to hold and pet, I can't recommend them. They are still wild ducks.
When i put out food the past 2 days, the drake has come really close to me. Today he actually came within 2 feet of me to come eat from the food bowl, while i was cleaning the aviary out. He would come sneak up and i would look down and not at him, because they both seem to get more freightenened if you look directly at them from that close. So if i looked down at the rocks i was cleaning, he would inch up to the bowl and grab a pellet or 2 of food and run a few feet away to eat and then come back and he did that a few times. It was pretty cute.
edit: just saw your new last post about wanting to use them for eggs. Might want to take mine off the list.