Dave

Yes.  I have seen and/or heard:  Great Horned Owls, Great Gray Owl,  Barn Owls, Western & Eastern Screech Owls, Spotted Owl, Barred Owl, Northern Pygmy-Owl, Northern Saw-whet Owl, Flammulated Owl and Burrowing Owls, all in the wild.  I have seen other owls in captivity only.  I did see a Sparx Owl, a hybrid between a Spotted Owl and a Barred Owl that was in captivity at Humboldt State University. I hear Great Horned Owls pretty frequently, and sometimes (some years) I have heard Western Screech Owls pretty frequently.  I usually hear a Barn Owl a couple times per year. I have built bird boxes for Western Screech Owls and Flammulated Owls.  I have had Screech Owls use several of my boxes and also nest in my attic. I helped relocate a Spotted Owl and reband it.  My grandkids got to select the bands, and handle the owl.  I have also held out a stick with a mouse on it for a Spotted Owl to come down and take it for food!