Identifiers: city · town · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Portage (city), IN | 37,926 |
| 2 | Merrillville (town), IN | 36,444 |
| 3 | Valparaiso (city), IN | 34,151 |
| 4 | Hobart (city), IN | 29,752 |
| 5 | Chesterton (town), IN | 14,241 |
| 6 | Lake Station (city), IN | 13,235 |
| 7 | Winfield (town), IN | 7,181 |
| 8 | Lakes of the Four Seasons (CDP), IN | 7,091 |
| 9 | Westville (town), IN | 5,257 |
| 10 | Porter (town), IN | 5,210 |
| 11 | South Haven (CDP), IN | 5,084 |
| 12 | Hebron (town), IN | 3,755 |
| 13 | Shorewood Forest (CDP), IN | 3,033 |
| 14 | Aberdeen (CDP), IN | 2,117 |
| 15 | Trail Creek (town), IN | 2,060 |
| 16 | Burns Harbor (town), IN | 2,055 |
| 17 | Kouts (town), IN | 2,028 |
| 18 | New Chicago (town), IN | 1,999 |
| 19 | Salt Creek Commons (CDP), IN | 1,979 |
| 20 | Ogden Dunes (town), IN | 1,168 |