Place
- North Central Appalachians1
- North Dakota1
- Northeastern Coastal Zone1
- Northeastern Highlands1
- Northern Appalachian Plateau and Uplands1
- Northern Basin and Range1
- Northern Central Hardwood Forests1
- Northern Glaciated Plains1
- Northern Hemisphere1
- Northern Lakes and Forests1
- Northern Minnesota Wetlands1
- Northern Montana Glaciated Plains1
- Northern Piedmont1
- Northern Rockies1
- Northwestern Glaciated Plains1
- Northwestern Great Plains1
- Ohio1
- Oklahoma1
- Omernik Ecoregions1
- Oregon1