| Northwest Adventist Christian School ✓ | Crown Point | K-8 | 11 | 11 | Seventh-Day Adventist |
| Trinity Lutheran School ✓ | Crown Point | PreK-8 | 166 | 12.4 | Lutheran Church (Missouri Synod) |
| St. Stanislaus School ✓ | East Chicago | PreK-8 | 157 | 12.8 | Roman Catholic |
| Ambassador Christian Academy ✓ | Gary | K-8 | 184 | 12.9 | Christian (nondenominational) |
| Life Christian Steam Academy ✓ | Gary | K-5 | 44 | 11 | Christian (nondenominational) |
| My Safari Preparatory Academy ✓ | Gary | PreK-K | 6 | 6 | Nonsectarian |
| Calumet Christian School ✓ | Griffith | K-12 | 191 | 11.9 | Christian (nondenominational) |
| St. Mary School ✓ | Griffith | PreK-8 | 193 | 17.5 | Roman Catholic |
| Montessori Childrens Schoolhouse ✓ | Hammond | PreK-8 | 93 | 11.6 | Nonsectarian |
| Morning Star Academy ✓ | Hammond | PreK-8 | 66 | 8.2 | Assembly of God |
| St. Casimir School ✓ | Hammond | PreK-8 | 340 | 19.1 | Roman Catholic |
| Bible Baptist School ✓ | Highland | K-10 | 26 | 5.2 | Baptist |
| Highland Christian School ✓ | Highland | PreK-8 | 531 | 14.2 | Calvinist |
| Our Lady of Grace School ✓ | Highland | PreK-8 | 144 | 14 | Roman Catholic |
| Montessori Academy in the Oaks ✓ | Hobart | PreK-3 | 22 | 11 | Nonsectarian |
| Trinity Lutheran School ✓ | Hobart | PreK-8 | 54 | 8.2 | Lutheran Church (Missouri Synod) |
| Andrean High School ✓ | Merrillville | 9-12 | 455 | 13.5 | Roman Catholic |
| St. Paul's Lutheran School ✓ | Munster | PreK-8 | 157 | 10.8 | Lutheran Church (Missouri Synod) |
| St. Thomas More School ✓ | Munster | PreK-8 | 468 | 16 | Roman Catholic |
| Crown Point Christian School ✓ | Saint John | PreK-8 | 837 | 15.8 | Christian (nondenominational) |
| St. John Evangelist School ✓ | Saint John | PreK-8 | 371 | 14.3 | Roman Catholic |
| Forest Ridge Academy ✓ | Schererville | PreK-8 | 157 | 5.7 | Nonsectarian |
| Hammond Baptist High School ✓ | Schererville | PreK-12 | 265 | 13.9 | Baptist |
| Indiana Horizon Academy | Crown Point | PreK-8 | 145 | 8.3 | Islamic |
| Illiana Christian High School | Dyer | 9-12 | 545 | 14.2 | Calvinist |
| Plum Creek Christian Academy | Dyer | PreK-12 | 243 | 13.5 | Baptist |
| Plum Creek Christian Academy | Dyer | PreK-12 | 242 | 13.6 | Baptist |
| Protestant Reformed/Heritage Christian Schools | Dyer | K-12 | 217 | 10.8 | Calvinist |
| Providence Christian Academy | Dyer | PreK-10 | 53 | 7.6 | Presbyterian |
| Ascension Lutheran Christian School | Gary | K-5 | 52 | 17.3 | Lutheran Church (Missouri Synod) |
| My Safari Preparatory Academy Georgia St. Campus | Gary | PreK-K | 5 | 5 | Nonsectarian |
| Repairer of the Breach Ministries (D211) | Gary | PreK-12 | 35 | 7 | Other religious |
| St. John Bosco Elementary School | Hammond | PreK-8 | 226 | 15.3 | Roman Catholic |
| Happydays Childcare Inc Dba Happy Days Highland | Highland | PreK-5 | 20 | 20 | Nonsectarian |
| Aquinas Catholic Community School | Merrillville | PreK-8 | 212 | 17.2 | Roman Catholic |
| Happy Days Child Care Center | Merrillville | K-Transitional K | 15 | 15 | Nonsectarian |
| Happy Days Learning Center | Merrillville | K | 8 | 8 | Nonsectarian |
| Montessori Academy of Nwi | Merrillville | PreK-K | 3 | 1 | Nonsectarian |
| St. Michael Catholic School | Schererville | PreK-8 | 202 | 11.2 | Roman Catholic |