Although Bluebirds, House Wrens and Black-capped Chickadees are some of the more common birds we think of when we put out bird houses, there are many other birds that use boxes. Some use them in the winter for roosting as well.
Tufted Titmice, White-breasted Nuthatches, Wood Ducks, American Kestrel's and Great-crested Flycatcher's are a few others that you may not have thought about. Occasionally House Finches will use them as well as Carolina Wrens, both of these birds are also at home in your hanging planters!
Every winter we have Downy Woodpeckers in every Bluebird House we own, and one made a new hole in a Chickadee House (the entrance hole was too small so he made a new one!). We also had a Yellow-shafted Flicker in our Screech Owl box. We missed having a Screech Owl but having the flicker was pretty cool too.
We stock most of these houses and we can special order any other houses mentioned. Some houses may be used by different species depending on where you place them (woods versus field, etc).