Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Gary Fire Station Number 6 | Building | 182 | Lake | 41 36 06 N | 087 21 08 W |
| Gary Fire Station Number 7 | Building | 186 | Lake | 41 36 05 N | 087 15 41 W |
| Gary Fire Station Number 8 | Building | 183 | Lake | 41 36 08 N | 087 22 20 W |
| Gary Fire Station Number 9 | Building | 182 | Lake | 41 35 50 N | 087 23 37 W |
| Gary Public Library | Building | 183 | Lake | 41 36 09 N | 087 20 25 W |
| Gary Public Schools Memorial Auditorium | Building | 184 | Lake | 41 35 52 N | 087 20 11 W |
| Gellersen Center | Building | 241 | Porter | 41 27 46 N | 087 02 16 W |
| Gene Stratton Porter Hall | Building | 184 | Lake | 41 35 07 N | 087 28 23 W |
| Genesis Convention Center | Building | 183 | Lake | 41 36 10 N | 087 20 20 W |
| Glen Park Community Center | Building | 192 | Lake | 41 32 50 N | 087 20 13 W |
| Griffith Branch Lake County Public Library | Building | 188 | Lake | 41 32 21 N | 087 25 40 W |
| Guild Hall | Building | 241 | Porter | 41 27 47 N | 087 02 45 W |
| Gyte Annex | Building | 184 | Lake | 41 35 09 N | 087 28 30 W |
| Hammond Central Fire Station | Building | 181 | Lake | 41 36 10 N | 087 30 35 W |
| Hammond City Hall | Building | 181 | Lake | 41 36 19 N | 087 30 30 W |
| Hammond Civic Center | Building | 181 | Lake | 41 36 27 N | 087 30 46 W |
| Hammond Fire Station Number 1 | Building | 178 | Lake | 41 37 25 N | 087 30 31 W |
| Hammond Fire Station Number 2 | Building | 178 | Lake | 41 40 24 N | 087 30 30 W |
| Hammond Fire Station Number 5 | Building | 184 | Lake | 41 36 03 N | 087 31 18 W |
| Hammond Fire Station Number 6 | Building | 187 | Lake | 41 35 17 N | 087 27 49 W |
| Hammond Fire Station Number 7 | Building | 184 | Lake | 41 34 53 N | 087 29 27 W |
| Hammond Fire Station Number 8 | Building | 181 | Lake | 41 35 45 N | 087 26 55 W |
| Hammond Public Library | Building | 180 | Lake | 41 37 04 N | 087 30 54 W |
| Hansel Neighborhood Center | Building | 218 | St. Joseph | 41 40 32 N | 086 15 59 W |
| Hansen Branch Hammond Public Library | Building | 183 | Lake | 41 35 27 N | 087 27 39 W |
| Hawthorn Hall | Building | 182 | Lake | 41 33 24 N | 087 20 15 W |
| Heidbrink Hall | Building | 240 | Porter | 41 27 47 N | 087 02 53 W |
| Hellenic Community Center | Building | 183 | Lake | 41 35 26 N | 087 20 37 W |
| Heritage Hall | Building | 235 | Porter | 41 27 44 N | 087 03 16 W |
| Highland Branch Lake County Public Library | Building | 190 | Lake | 41 33 17 N | 087 27 35 W |
| Highland Central Fire Station | Building | 188 | Lake | 41 33 21 N | 087 27 33 W |
| Highland South Fire Station | Building | 188 | Lake | 41 32 16 N | 087 27 51 W |
| Highland Town Hall | Building | 189 | Lake | 41 33 13 N | 087 26 52 W |
| Hobart Branch Lake County Public Library | Building | 186 | Lake | 41 32 02 N | 087 15 23 W |
| Hobart Carnegie Library | Building | 189 | Lake | 41 31 56 N | 087 15 06 W |
| Howard Branch Hammond Public Library | Building | 186 | Lake | 41 35 06 N | 087 26 31 W |
| Huegli Hall | Building | 242 | Porter | 41 27 51 N | 087 02 36 W |
| Indiana Harbor Fire Station Number 2 | Building | 181 | Lake | 41 39 04 N | 087 26 51 W |
| Indiana State Museum | Building | 218 | Marion | 39 46 12 N | 086 09 10 W |
| Indiana Youth Center | Building | 237 | Hendricks | 39 41 25 N | 086 24 53 W |
| Izaak Walton League Building | Building | 136 | Warrick | 38 03 49 N | 087 19 26 W |
| John F Kennedy Branch Gary Public Library | Building | 192 | Lake | 41 32 47 N | 087 20 10 W |
| John Stewart Memorial Settlement House | Building | 184 | Lake | 41 35 16 N | 087 20 08 W |
| Knights of Pythias Home | Building | 199 | Tippecanoe | 40 24 05 N | 086 52 28 W |
| Kretzmann Hall | Building | 241 | Porter | 41 27 43 N | 087 02 23 W |
| Kroencke Hall | Building | 240 | Porter | 41 27 47 N | 087 02 56 W |
| Lake County Childrens Home | Building | 186 | Lake | 41 34 35 N | 087 20 27 W |
| Lake County Courthouse | Building | 183 | Lake | 41 36 13 N | 087 20 17 W |
| Lankenau Hall | Building | 241 | Porter | 41 27 57 N | 087 02 31 W |
| LeBien Hall | Building | 243 | Porter | 41 27 59 N | 087 02 50 W |
| Levi Coffin House | Building | 337 | Wayne | 39 57 28 N | 084 55 07 W |
| Lindenwood Hall | Building | 182 | Lake | 41 33 17 N | 087 20 47 W |
| Linwood House | Building | 232 | Porter | 41 27 40 N | 087 02 40 W |
| Logansport - Cass County Public Library | Building | | Cass | 40 45 18 N | 086 21 43 W |
| Loke Hall | Building | 238 | Porter | 41 27 43 N | 087 02 56 W |
| Louis J Bailey Branch Gary Public Library (historical) | Building | 183 | Lake | 41 35 16 N | 087 20 29 W |
| Lowell Public Library | Building | 205 | Lake | 41 17 38 N | 087 25 09 W |
| Macedonian Hall (historical) | Building | 184 | Lake | 41 35 31 N | 087 20 38 W |
| Marram Hall | Building | 183 | Lake | 41 33 20 N | 087 20 15 W |
| Martin Luther King Cultural Center | Building | 236 | Porter | 41 27 45 N | 087 03 12 W |
| Mary Gorman Specker Memorial Library (historical) | Building | 179 | Lake | 41 37 40 N | 087 28 49 W |
| Masonic Home | Building | 220 | Johnson | 39 28 21 N | 086 02 52 W |
| Meier Hall | Building | 241 | Porter | 41 27 44 N | 087 02 19 W |
| Memorial Hall | Building | 241 | Porter | 41 27 47 N | 087 02 47 W |
| Memorial Opera House | Building | 235 | Porter | 41 27 59 N | 087 03 34 W |
| Millard E Gyte Building | Building | 184 | Lake | 41 35 08 N | 087 28 30 W |
| Miller Hall | Building | 243 | Porter | 41 28 00 N | 087 02 53 W |
| Miller Purdue Agricultural Center | Building | 281 | Grant | 40 28 20 N | 085 27 20 W |
| Miller Town Hall | Building | 186 | Lake | 41 36 02 N | 087 15 41 W |
| Missions Building | Building | 248 | Marion | 39 45 59 N | 086 04 40 W |
| Moellering Library | Building | 242 | Porter | 41 27 51 N | 087 02 31 W |
| Moraine Student Center | Building | 182 | Lake | 41 33 26 N | 087 20 17 W |
| Morris-Butler House | Building | 219 | Marion | 39 47 00 N | 086 08 53 W |
| Mueller Hall | Building | 240 | Porter | 41 27 44 N | 087 02 42 W |
| Munster Branch Lake County Public Library | Building | 187 | Lake | 41 33 18 N | 087 30 31 W |
| Munster Town Hall | Building | 188 | Lake | 41 33 43 N | 087 30 14 W |
| National Guard Armory | Building | 316 | Steuben | 41 38 45 N | 084 59 35 W |
| Neils Science Center | Building | 241 | Porter | 41 27 53 N | 087 02 25 W |
| Odd Fellows Home | Building | 290 | Decatur | 39 20 23 N | 085 27 56 W |
| Old Jail Museum | Building | 234 | Porter | 41 27 58 N | 087 03 34 W |
| Ora L Wildermuth Branch Gary Public Library | Building | 186 | Lake | 41 36 05 N | 087 16 04 W |
| Ouiatenon Blockhouse | Building | 161 | Tippecanoe | 40 24 23 N | 086 57 50 W |
| Parkview Junior High B-7 Building | Building | 327 | Henry | 39 54 39 N | 085 22 36 W |
| Porter County Administrative Center | Building | 232 | Porter | 41 27 58 N | 087 03 45 W |
| Porter County Courthouse | Building | 236 | Porter | 41 28 02 N | 087 03 37 W |
| Porter County Home | Building | 211 | Porter | 41 27 04 N | 087 04 29 W |
| Porter County Jail (historical) | Building | 234 | Porter | 41 27 58 N | 087 03 34 W |
| President Harrisons Home | Building | 219 | Marion | 39 47 02 N | 086 09 17 W |
| Raintree Hall | Building | 182 | Lake | 41 33 23 N | 087 20 19 W |
| Sacred Heart Home | Building | 305 | Noble | 41 22 29 N | 085 15 05 W |
| Saint Anns Home | Building | 181 | Lake | 41 36 20 N | 087 29 57 W |
| Savannah Center | Building | 182 | Lake | 41 33 27 N | 087 20 15 W |
| Sawyer Branch Hammond Public Library | Building | 184 | Lake | 41 35 28 N | 087 30 43 W |
| Scheele Hall | Building | 242 | Porter | 41 27 57 N | 087 02 33 W |
| Schnabel Hall | Building | 241 | Porter | 41 27 49 N | 087 02 17 W |
| Schneider Community Hall | Building | 193 | Lake | 41 10 53 N | 087 26 54 W |
| Shultz-Lewis Childrens Home | Building | 219 | Porter | 41 23 15 N | 087 02 14 W |
| Smith Esteb Memorial Home | Building | 302 | Wayne | 39 44 11 N | 084 55 44 W |
| South Haven Branch Porter County Public Library | Building | 200 | Porter | 41 32 27 N | 087 08 25 W |
| South Lake County Community Services | Building | 221 | Lake | 41 22 10 N | 087 25 07 W |
| Spring Mill | Building | 186 | Orange | 38 31 42 N | 086 25 26 W |
| State Capitol | Building | 216 | Marion | 39 46 06 N | 086 09 46 W |
| State Soldiers Home | Building | 209 | Tippecanoe | 40 28 19 N | 086 53 24 W |
| Steuben County Rest Home | Building | 308 | Steuben | 41 39 58 N | 085 01 36 W |
| Student Faculty Library Center | Building | 183 | Lake | 41 35 04 N | 087 28 27 W |
| Sun Building | Building | 182 | Lake | 41 36 08 N | 087 20 13 W |
| Sycamore Hall | Building | 182 | Lake | 41 33 17 N | 087 20 48 W |
| Tamarack Hall | Building | 182 | Lake | 41 33 25 N | 087 20 22 W |
| Theodore Roosevelt Branch Gary Public Library (historical) | Building | 184 | Lake | 41 34 25 N | 087 20 36 W |
| Tolleston Branch Gary Public Library | Building | 182 | Lake | 41 35 27 N | 087 21 56 W |