17 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Portage | 1 | 38,882 | 37,959 | 0.48% | 1,517 | 25.63 | City |
| Valparaiso | 2 | 34,937 | 34,162 | 0.45% | 2,082 | 16.78 | City |
| Chesterton | 3 | 14,913 | 14,273 | 0.87% | 1,585 | 9.41 | Town |
| South Haven | 4 | 7,726 | 5,017 | 2.15% | 3,401 | 2.27 | CDP |
| Porter | 5 | 5,205 | 5,202 | 0.02% | 845 | 6.16 | Town |
| Hebron | 6 | 3,725 | 3,749 | -0.13% | 1,863 | 2 | Town |
| Shorewood Forest | 7 | 3,342 | 2,931 | 1.27% | 1,760 | 1.90 | CDP |
| Burns Harbor | 8 | 2,185 | 2,077 | 1.02% | 339 | 6.44 | Town |
| Kouts | 9 | 2,068 | 2,032 | 0.34% | 1,705 | 1.21 | Town |
| Salt Creek Commons | 10 | 1,788 | 1,941 | -1.21% | 4,806 | 0.37 | CDP |
| Aberdeen | 11 | 1,726 | 1,698 | -0.58% | 1,373 | 1.26 | CDP |
| Ogden Dunes | 12 | 1,167 | 1,181 | -0.26% | 1,571 | 0.74 | Town |
| Beverly Shores | 13 | 604 | 601 | 0.17% | 169 | 3.58 | Town |
| Town Pines | 14 | 594 | 594 | 0% | 263 | 2.25 | Town |
| Dune Acres | 15 | 234 | 234 | 0% | 110 | 2.13 | Town |
| Wheeler | 16 | 83 | 229 | -22.43% | 31 | 2.66 | CDP |
| Boone Grove | 17 | 36 | 0 | 5.88% | 133 | 0.27 | CDP |
Portage is the largest city in Porter County, with a population of 38,882.
Boone Grove is the smallest city in Porter County.
There are 17 cities in Porter County, Indiana.