41 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| North township | 1 | 152,278 | 156,525 | -0.45% | 2,867 | 53.12 | Township |
| Calumet township | 2 | 89,355 | 91,850 | -0.45% | 1,455 | 61.43 | Township |
| Hammond | 3 | 75,146 | 77,763 | -0.69% | 3,304 | 22.74 | City |
| St. John township | 4 | 72,014 | 69,119 | 0.7% | 1,835 | 39.25 | Township |
| Gary | 5 | 66,747 | 69,009 | -0.67% | 1,337 | 49.93 | City |
| Ross township | 6 | 48,908 | 48,547 | 0.36% | 997 | 49.03 | Township |
| Center township | 7 | 41,049 | 38,738 | 1.13% | 1,044 | 39.32 | Township |
| Hobart township | 8 | 39,924 | 40,646 | -0.25% | 1,568 | 25.46 | Township |
| Merrillville | 9 | 36,273 | 36,457 | -0.1% | 1,092 | 33.22 | Town |
| Crown Point | 10 | 35,474 | 33,998 | 0.84% | 1,866 | 19.01 | City |
| Schererville | 11 | 29,654 | 29,661 | 0% | 1,963 | 15.11 | Town |
| Hobart | 12 | 29,202 | 29,717 | -0.35% | 1,115 | 26.20 | City |
| St. John | 13 | 25,729 | 20,516 | 4.23% | 2,020 | 12.74 | Town |
| East Chicago | 14 | 25,488 | 26,342 | -0.67% | 1,806 | 14.11 | City |
| Munster | 15 | 23,432 | 23,887 | -0.39% | 3,109 | 7.54 | Town |
| Highland | 16 | 23,233 | 23,962 | -0.62% | 3,355 | 6.92 | Town |
| Cedar Lake | 17 | 17,320 | 14,190 | 3.75% | 1,882 | 9.20 | Town |
| Dyer | 18 | 16,221 | 16,500 | -0.34% | 2,635 | 6.16 | Town |
| Griffith | 19 | 16,020 | 16,525 | -0.63% | 2,062 | 7.77 | Town |
| Winfield township | 20 | 14,423 | 13,001 | 2.32% | 583 | 24.75 | Township |
| Cedar Creek township | 21 | 13,234 | 12,763 | 0.52% | 221 | 59.97 | Township |
| Lake Station | 22 | 12,901 | 13,266 | -0.56% | 1,556 | 8.29 | City |
| Lowell | 23 | 11,593 | 10,707 | 1.55% | 1,651 | 7.02 | Town |
| Winfield | 24 | 8,575 | 7,249 | 3.19% | 692 | 12.40 | Town |
| West Creek township | 25 | 7,959 | 7,700 | 0.49% | 128 | 61.96 | Township |
| Lakes Four Seasons | 26 | 7,728 | 7,081 | 0.6% | 3,392 | 2.28 | CDP |
| Highland | 27 | 5,865 | 5,276 | 1.58% | 2,586 | 2.27 | CDP |
| Whiting | 28 | 4,462 | 4,571 | -0.49% | 2,469 | 1.81 | City |
| Shelby township | 29 | 2,535 | 2,482 | 0.36% | 47 | 53.57 | Township |
| New Chicago | 30 | 1,937 | 1,997 | -0.62% | 2,878 | 0.67 | Town |
| Shelby township | 31 | 1,833 | 1,882 | -0.87% | 63 | 28.98 | Township |
| Eagle Creek township | 32 | 1,729 | 1,726 | 0.06% | 31 | 55.84 | Township |
| Hammond township | 33 | 1,626 | 1,611 | 0.31% | 40 | 40.94 | Township |
| Highland township | 34 | 1,495 | 1,487 | 0.07% | 27 | 54.54 | Township |
| Lake Dalecarlia | 35 | 1,471 | 1,779 | 0.48% | 1,304 | 1.13 | CDP |
| Highland township | 36 | 1,420 | 1,414 | -0.14% | 46 | 30.57 | Township |
| Shelby township | 37 | 1,128 | 1,126 | 0.36% | 23 | 48.33 | Township |
| Shelby township | 38 | 1,015 | 985 | 0.79% | 15 | 69.11 | Township |
| Highland township | 39 | 748 | 718 | 0.94% | 23 | 32.47 | Township |
| Schneider | 40 | 256 | 268 | -0.78% | 298 | 0.86 | Town |
| Shelby | 41 | 250 | 370 | -7.41% | 194 | 1.29 | CDP |
North township is the largest city in Lake County, with a population of 152,278.
Shelby is the smallest city in Lake County.
There are 41 cities in Lake County, Indiana.