Northwest
- 24. Farris Prarie Nature Preserve, White County
- 35. Prophetstown State Park, Tippecanoe County
- 36. Fern Cliff Nature Preserve, Putnam County
- 39. Big Walnut Nature Preserve, Putnam County
- 43. Grand Kankakee Marsh Project, Lake County
- 47. Mansfield Roller Mill Historic Site, Parke County
- 50. Grand Kankakee Marsh Restoration Project, Starke County
- 58. John Merle Coulter Nature Preserve, Porter County
- 66. Chamberlain Lake Nature Preserve, St. Joseph County
- 67. Grand Kankakee Marsh Restoration Project, St. Joseph County
- 68. Big Walnut Nature Preserve, Putnam County
- 69. Conrad Savanna Nature Preserve
- 70. Cressmoore Prairie Nature Preserve, Lake County
- 75. Moraine Nature Preserve, Porter County
- 79. Winamac Fish & Wildlife Area, Pulaski County
- 86. Kankakee Sands Prairie Wetlands Restoration Project, Newton County
- 87. Seidner Dune & Swale Nature Preserve, Lake County
- 116. Cressmoore Prairie Nature Preserve, Lake County
- 119. Hoosier Prairie Nature Preserve, Lake County
- 120. Moraine Nature Preserve, Porter County
- 121. Big Walnut Nature Preserve, Putnam County
- 124. Celery Bog Nature Area, Tippecanoe County
- 125. Burnett Woods Nature Preserve, Hendricks County
- 127. Wabash Bottoms Heritage Trail, Tippecanoe County
- 146. Big Walnut Nature Preserve, Putnam County
- 149. Big Walnut Nature Preserve, Putnam County
- 159. Little Calumet River Headwaters, LaPorte County
- 160. Lake Manitou Island Wetland, Fulton County
- 166. Deep Rivers Headwaters, Lake County
- 173. Wabash Bottoms Heritage Trail, Warren County
- 181. Black Rock Barrens Nature Preserve, Warren County
- 186. Place Trail Marsh, Saint Joseph County
- 189. B&O Trailhead and Hendricks County Park, Hendricks County
- 192. Big Walnut Nature Preserve, Putnam County
- 198. Wintergreen Woods Nature Preserve, LaPorte County
- 199. Yellow Birch Fen Nature Preserve, Porter County
- 201. Big Walnut Nature Preserve, Putnam County
- 211. Big Walnut / McNamara Tract, Putnam County
- 221. Cedar Lake Marsh, Lake County
- 222. Wildcat Creek Scenic Stream, Carroll County
- 227. Granville Sand Nature Preserve, Tippecanoe County
- 229. McCloud Nature Park, Hendricks County
- 239. Kingsbury Fish and Wildlife Area, LaPorte County
- 252. Thompson Bog, Nature Preserve
- 254. Celery Bog Nature Area, Tippecanoe County
- 262. Portland Arch Nature Preserve
- 265. Ambler Flatwoods Nature Preserve
- 266. Fisher Oak Savanna Nature Preserve, Jasper County
- 268. Moraine Nature Preserve
- 276.Big Walnut Nature Preserve/ Hemlock Refugia Nature Preserve
- 278. Calvert & Porter Woods Nature Preserve
- 284. Manitou Islands Wetlands Conservancy
- 294. Pyrmont Mill Natural Area
- 298A. Big Walnut Nature Preserve
- 299. Portage Salt Creek Natural Area
- 303. Mossy Point Nature Preserve
- 306. Spicer Lake Nature Preserve
