| Nom du Parc | Etat/Ville | Type du Parc |
|---|---|---|
| Ice Age National Scenic Trail | Wisconsin | National Scenic Trail |
| Icelandic State Park | Dakota du Nord (Cavalier) | State Park |
| Ichetucknee Springs State Park | Floride (Fort White) | State Park |
| Ike Kinswa State Park | Washington (Silver Creek) | State Park |
| Illahee State Park | Washington (Sylvan Way Bremerton) | State Park |
| Illini State Park | Illinois (Marseilles) | State Park |
| Illinois & Michigan Canal National Heritage Corridor | Illinois (Lockport) | National Heritage Corridor |
| Illinois River Forks State Park | Oregon (Medford) | State Park |
| Independence Dam State Park | Ohio (Defiance) | State Park |
| Independence National Historical Park | Pennsylvanie (Philadelphia) | National Historical Park |
| Indian Cave State Park | Nebraska (Shubert) | State Park |
| Indian Key Historic State Park | Floride (Islamorada) | State Park |
| Indian Lake State Park | Michigan (Manistique) | State Park |
| Indian Lake State Park | Ohio (Lakeview) | State Park |
| Indian Mountain State Park | Tennessee (Jellico) | State Park |
| Indian Springs State Park | Georgie (Flovilla) | State Park |
| Indian Well State Park | Connecticut (Shelton) | State Park |
| Indiana Dunes National Park | Indiana (Porter) | National Park |
| Indiana Dunes State Park | Indiana (Chesterton) | State Park |
| Inks Lake State Park | Texas (Burnet) | State Park |
| Interlochen State Park | Michigan (Interlochen) | State Park |
| Interstate State Park | Minnesota (Taylors Falls) | State Park |
| Inupiat Heritage Center | Alaska (Barrow) | |
| Island Beach State Park | New Jersey (Seaside Park) | State Park |
| Isle Royale National Park | Michigan (Houghton) | National Park |
| Itasca State Park | Minnesota (Park Rapids) | State Park |
