| Aleutian/Bering Sea Islands (BCR 1) |
14 |
36 |
| Western Alaska (BCR 2) |
1 |
1 |
| Northwestern Interior Forest (BCR 4) |
1 |
65 |
| Northern Pacific Rainforest (BCR 5) |
5 |
69 |
| Great Basin (BCR 9) |
7 |
540 |
| Northern Rockies (BCR 10) |
4 |
120 |
| Prairie Potholes (BCR 11) |
14 |
1216 |
| Boreal Hardwood Transition (BCR 12) |
4 |
358 |
| Lower Great Lakes/ St. Lawrence Plain (BCR 13) |
7 |
786 |
| Atlantic Northern Forest (BCR 14) |
10 |
1360 |
| Southern Rockies/Colorado Plateau (BCR 16) |
2 |
765 |
| Central Mixed Grass Prairie (BCR 19) |
2 |
119 |
| Edwards Plateau (BCR 20) |
1 |
20 |
| Oaks And Prairies (BCR 21) |
1 |
40 |
| Eastern Tallgrass Prairie (BCR 22) |
12 |
558 |
| Prairie Hardwood Transition (BCR 23) |
23 |
4164 |
| Central Hardwoods (BCR 24) |
25 |
2677 |
| West Gulf Coastal Plain/Ouachitas (BCR 25) |
5 |
240 |
| Mississippi Alluvial Valley (BCR 26) |
12 |
856 |
| Southeastern Coastal Plain (BCR 27) |
23 |
2699 |
| Appalachian Mountains (BCR 28) |
31 |
2635 |
| Piedmont (BCR 29) |
4 |
1339 |
| New England/Mid-Atlantic Coast (BCR 30) |
35 |
2740 |
| Peninsular Florida (BCR 31) |
6 |
716 |
| Coastal California (BCR 32) |
4 |
184 |
| Sonoran And Mojave Deserts (BCR 33) |
10 |
1184 |
| Sierra Madre Occidental (BCR 34) |
1 |
6 |
| Chihuahuan Desert (BCR 35) |
1 |
10 |
| Tamaulipan Brushlands (BCR 36) |
3 |
49 |
| Gulf Coastal Prairie (BCR 37) |
3 |
145 |