41 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| North | 1 | 153,175 | 156,516 | -0.16% | 2,884 | 53 | Township |
| Calumet | 2 | 89,906 | 91,843 | -0.15% | 1,464 | 61 | Township |
| Hammond | 3 | 75,598 | 77,755 | -0.57% | 3,324 | 23 | City |
| St. John | 4 | 72,145 | 69,137 | 0.79% | 1,838 | 39 | Township |
| Gary | 5 | 67,192 | 69,006 | -0.54% | 1,346 | 50 | City |
| Ross | 6 | 49,933 | 48,552 | 1.4% | 1,018 | 49 | Township |
| Center | 7 | 40,750 | 38,730 | 0.79% | 1,036 | 39 | Township |
| Hobart | 8 | 40,136 | 40,654 | 0% | 1,576 | 25 | Township |
| Merrillville | 9 | 37,121 | 36,459 | 0.36% | 1,117 | 33 | Town |
| Crown Point | 10 | 35,372 | 33,996 | 0.78% | 1,861 | 19 | City |
| Schererville | 11 | 29,809 | 29,663 | 0.1% | 1,973 | 15 | Town |
| Hobart | 12 | 29,342 | 29,719 | -0.26% | 1,120 | 26 | City |
| East Chicago | 13 | 25,624 | 26,344 | -0.56% | 1,816 | 14 | City |
| St. John | 14 | 25,182 | 20,522 | 3.84% | 1,977 | 13 | Town |
| Munster | 15 | 23,571 | 23,886 | -0.27% | 3,127 | 8 | Town |
| Highland | 16 | 23,380 | 23,962 | -0.5% | 3,376 | 7 | Town |
| Cedar Lake | 17 | 16,954 | 14,203 | 3.35% | 1,842 | 9 | Town |
| Dyer | 18 | 16,301 | 16,498 | -0.24% | 2,648 | 6 | Town |
| Griffith | 19 | 16,109 | 16,523 | -0.51% | 2,073 | 8 | Town |
| Winfield | 20 | 14,815 | 13,008 | 3.65% | 598 | 25 | Township |
| Cedar Creek | 21 | 13,406 | 12,765 | 1.17% | 224 | 60 | Township |
| Lake Station | 22 | 12,974 | 13,267 | -0.45% | 1,564 | 8 | City |
| Lowell | 23 | 11,635 | 10,704 | 1.62% | 1,657 | 7 | Town |
| Winfield | 24 | 8,883 | 7,253 | 3.81% | 717 | 12 | Town |
| West Creek | 25 | 8,042 | 7,701 | 1.02% | 130 | 62 | Township |
| Lakes Four Seasons | 26 | 7,728 | 7,081 | 0.6% | 3,392 | 2 | CDP |
| Highland | 27 | 5,865 | 5,276 | 1.58% | 2,586 | 2 | CDP |
| Whiting | 28 | 4,471 | 4,569 | -0.45% | 2,474 | 2 | City |
| Shelby | 29 | 2,543 | 2,483 | 0.04% | 47 | 54 | Township |
| New Chicago | 30 | 1,970 | 1,999 | -0.3% | 2,927 | 1 | Town |
| Shelby | 31 | 1,887 | 1,881 | 0.64% | 65 | 29 | Township |
| Eagle Creek | 32 | 1,758 | 1,727 | 0.51% | 31 | 56 | Township |
| Hammond | 33 | 1,657 | 1,608 | 1.1% | 40 | 41 | Township |
| Highland | 34 | 1,532 | 1,489 | 1.26% | 28 | 55 | Township |
| Lake Dalecarlia | 35 | 1,471 | 1,779 | 0.48% | 1,304 | 1 | CDP |
| Highland | 36 | 1,418 | 1,414 | -0.42% | 46 | 31 | Township |
| Shelby | 37 | 1,117 | 1,125 | -0.09% | 23 | 48 | Township |
| Shelby | 38 | 1,000 | 987 | 0.1% | 14 | 69 | Township |
| Highland | 39 | 752 | 719 | 0.8% | 23 | 32 | Township |
| Schneider | 40 | 260 | 269 | -0.76% | 302 | 1 | Town |
| Shelby | 41 | 250 | 370 | -7.41% | 194 | 1 | CDP |
North is the largest city in Lake County, with a population of 153,175.
Shelby is the smallest city in Lake County, with a population of 250.
There are 41 cities in Lake County, Indiana.