| Interior Floor Space | Diameter of Entrance Hole | Center of Entrance Hole to Floor | Depth of Cavity | Height of Box Placement |
| BLUEBIRDS (Eastern and Western) | ||||
| 5x5" | 1-1/2" | 7" | 8-9" | 5-15' |
| CHICKADEE (black-capped, Carolina, Boreal, and chestnut-backed) | ||||
| 4x4" | 1-1/8" | 6-8" | 8-10" | 8-15' |
| FINCH (house) | ||||
| 6x6" | 2" | 4" | 6" | 8-12' |
| FLYCATCHERS (great crested, olivacous, Western, and ash-throated) | ||||
| 6x6" | 2" | 7-8" | 8-10" | 8-20' |
| NUTHATCHES (red- and white-breasted) | ||||
| 4x4" | 1-1/4" | 6" | 8" | 12' |
| OWL (barn) | ||||
| 10x18" | 6" | 7" | 15-18" | 12-18' |
| OWL (screech) | ||||
| 8x10" | 3-1/4" | 12" | 16-18" | 12-30' |
| OWL (barred) | ||||
| 13x15" | 8" | 9-10" | 16" | 10-30' |
| OWL (saw-whet) | ||||
| 7x7" | 2-1/2" | 12" | 12-15" | 15-20' |
| ROBIN (American) | ||||
| 7x7" | open on three sides | 8" | 6' | |
| SWALLOWS (barn) | ||||
| 6x6" | open on three sides | 6" | 8-12' | |
| SWALLOWS (purple martin) | ||||
| 6x6" | 2-1/2" | 2-1/2" | 6" | 15-20' |
| TITMICE (plain, tufted, and bridled) | ||||
| 4x4" | 1-1/4" | 6" | 6-8" | 6-15' |
| WARBLER | ||||
| 5x5" | 1-1/8 - 1-1/2" | 6-8" | 8-10" | 4-6' |
| WOODPECKER (downy) | ||||
| 4x4" | 1-1/4" | 6-8" | 8-10" | 12-15' |
| WOODPECKER (flicker) | ||||
| 7x7" | 2-1/2" | 14-16" | 16-18" | 6-20' |
| WOODPECKER (gold-fronted and hairy) | ||||
| 6x6" | 1-3/4 - 2" | 9-12" | 13-15" | 8-20' |
| WOODPECKER (red-headed and red-bellied) | ||||
| 6x6" | 2" | 9-12" | 12-15" | 12-20' |
| WRENS (Bewicks and house) | ||||
| 4x4" | 1-1/8" | 5-1/2" | 7-8" | 6-10' |
| WRENS (brown-throated) | ||||
| 4x4" | 1" | 3-1/2 - 6" | 6-8" | 6-10' |
