| Species | Floor (inches) |
Depth of Cavity at Front (inches) | Height of Center of Entry Hole (inches) | Diameter of Entry Hole (inches) | Approx. Height of Box Above Ground (feet) | Preferred habitat & box location |
| House Wren | 4 x 4 |
7 |
5 |
1 |
6 |
Open fields and thickets |
| Bewick's Wren | 4 x 4 |
7 |
5 |
1-1/8 |
6 |
Open fields and thickets |
| Carolina Wren | 4 x 4 |
7 |
5 |
1-3/8 |
6 |
Open fields and thickets |
| Black-capped Chickadee | 4 x 4 |
8 |
6 |
1-1/8 |
5 |
Open woods and edges |
| Carolina Chickadee | 4 x 4 |
8 |
6 |
1-1/8 |
5 |
Open woods and edges |
| Tufted Titmouse | 4 x 4 |
8 |
6 |
1-1/4 |
5 |
Open woods and edges |
| Red-breasted Nuthatch | 4 x 4 |
8 |
6 |
1-1/3 |
12 |
Open woods and edges |
| White-breasted Nuthatch | 4 x 4 |
9 |
7 |
1-1/4 |
12 |
Open woods and edges |
| Downy Woodpecker | 4 x 4 |
10 |
8 |
1-1/4 |
12 |
Forest openings and edges |
| Hairy Woodpecker | 5.5 x 5.5 |
14 |
11 |
1-3/4 |
20 |
Forest openings and edges |
| Golden-fronted Woodpecker | 6 x 6 |
14 |
11 |
2 |
8 to 20 |
Forest openings and edges |
| Pileated Woodpeckers | 12 x 12 |
24 |
19 |
4 |
15 to 25 |
Mature forests |
| Red-headed Woodpecker | 5.5 x 5.5 |
14 |
11 |
1-3/4 |
20 |
Forest openings and edges |
| Red-bellied Woodpecker | 6 x 6 |
14 |
11 |
2 |
20 |
Forest openings and edges |
| Northern Flicker | 7 x 7 |
16 |
13 |
2-1/2 |
15 |
Farmland, open country. Use a tree will shrubs underneath. |
| Tree Swallow | 5 x 5 |
6 |
4 |
1-1/2 |
5 |
Open land near water |
| Barn Swallow | 6 x 6 |
6 |
3 sides open |
3 sides open |
8 |
Open land |
| Purple Martin | 7 x 12 |
6 |
1 |
2-1/8 |
17 |
Pastures, fields, golf courses |
| Eastern Phoebe | 6 x 6 |
6 |
3 sides open |
3 sides open |
8 |
Weltered ledge over water, under bridge or on building. |
| Ash-throated Flycatcher | 6 x 6 |
12 |
8 |
1-3/4 |
6 to 20 |
Open, semi-arid country |
| Great Crested Flycatcher | 6 x 6 |
10 |
7.5 |
2 |
10 |
Open woods and edges |
| American Robin | 7 x 7 |
8 |
3 sides open |
3 sides open |
6 |
Open areas; side of house is a good place to mount box. |
| Eastern Bluebird | 5 x 5 |
9 |
7 |
1-1/2 |
4 |
Open land with scattered trees |
| House Finch | 6 x 6 |
6 |
4 |
2 |
8 |
Back yards and porches |
| American Kestrel | 8 x 8 |
16 |
13 |
3 |
20 |
Open fields, wooded edges, farmlands |
| Barred Owls | 14 x 14 |
28 |
23 |
8 |
15 to 30 |
Mature bottom land forests |
| Saw-whet Owl | 7 x 7 |
15 |
12 |
2-1/2 |
15 |
Forest clearings and edges |
| Screech Owl | 8 x 8 |
16 |
13 |
3 |
12 |
Farmland, orchards, woods |
| Barn Owl | 18 x 20 |
18 |
4 |
6 |
18 |
Farmland; high on barn, silo, or large tree; entrance hole should be four inches above floor. |
| Bufflehead | 7 x 7 |
18 |
14 |
3 |
8 to 15 |
Wooded lake shores and marshes |
| Wood Duck | 10 x 10 |
21 |
16 |
4 |
5 feet over water; 15 feet over land |
Wooded rivers or mashes |
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