37 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| North | 1 | 152,930 | 156,516 | -0.16% | 2,879 | 53 | Township |
| Calumet | 2 | 89,768 | 91,843 | -0.15% | 1,461 | 61 | Township |
| Hammond | 3 | 75,167 | 77,755 | -0.57% | 3,305 | 23 | City |
| St. John | 4 | 72,709 | 69,137 | 0.78% | 1,852 | 39 | Township |
| Gary | 5 | 66,829 | 69,006 | -0.54% | 1,338 | 50 | City |
| Ross | 6 | 50,621 | 48,552 | 1.38% | 1,032 | 49 | Township |
| Center | 7 | 41,069 | 38,730 | 0.78% | 1,044 | 39 | Township |
| Hobart | 8 | 40,137 | 40,654 | 0% | 1,576 | 25 | Township |
| Merrillville | 9 | 37,254 | 36,459 | 0.36% | 1,121 | 33 | Town |
| Crown Point | 10 | 35,647 | 33,996 | 0.78% | 1,875 | 19 | City |
| Schererville | 11 | 29,838 | 29,663 | 0.1% | 1,975 | 15 | Town |
| Hobart | 12 | 29,267 | 29,719 | -0.26% | 1,117 | 26 | City |
| St. John | 13 | 26,114 | 20,522 | 3.7% | 2,007 | 13 | Town |
| East Chicago | 14 | 25,480 | 26,344 | -0.56% | 1,806 | 14 | City |
| Munster | 15 | 23,508 | 23,886 | -0.27% | 3,119 | 8 | Town |
| Highland | 16 | 23,264 | 23,962 | -0.5% | 3,359 | 7 | Town |
| Cedar Lake | 17 | 17,504 | 14,203 | 3.24% | 1,852 | 9 | Town |
| Dyer | 18 | 16,262 | 16,498 | -0.24% | 2,642 | 6 | Town |
| Griffith | 19 | 16,026 | 16,523 | -0.52% | 2,063 | 8 | Town |
| Winfield | 20 | 15,337 | 13,008 | 3.52% | 620 | 25 | Township |
| Cedar Creek | 21 | 13,561 | 12,765 | 1.16% | 226 | 60 | Township |
| Lake Station | 22 | 12,916 | 13,267 | -0.45% | 1,557 | 8 | City |
| Lowell | 23 | 11,821 | 10,704 | 1.6% | 1,683 | 7 | Town |
| Winfield | 24 | 9,209 | 7,253 | 3.67% | 743 | 12 | Town |
| West Creek | 25 | 8,123 | 7,701 | 1.01% | 131 | 62 | Township |
| Whiting | 26 | 4,452 | 4,569 | -0.42% | 2,464 | 2 | City |
| Shelby | 27 | 2,544 | 2,483 | 0.04% | 47 | 54 | Township |
| New Chicago | 28 | 1,964 | 1,999 | -0.3% | 2,918 | 1 | Town |
| Shelby | 29 | 1,899 | 1,881 | 0.64% | 66 | 29 | Township |
| Eagle Creek | 30 | 1,767 | 1,727 | 0.51% | 32 | 56 | Township |
| Hammond | 31 | 1,675 | 1,608 | 1.09% | 41 | 41 | Township |
| Highland | 32 | 1,551 | 1,489 | 1.24% | 28 | 55 | Township |
| Highland | 33 | 1,412 | 1,414 | -0.42% | 46 | 31 | Township |
| Shelby | 34 | 1,116 | 1,125 | -0.09% | 23 | 48 | Township |
| Shelby | 35 | 1,001 | 987 | 0.1% | 14 | 69 | Township |
| Highland | 36 | 758 | 719 | 0.8% | 23 | 32 | Township |
| Schneider | 37 | 258 | 269 | -0.77% | 300 | 1 | Town |
North is the largest city in Lake County, with a population of 152,930.
Schneider is the smallest city in Lake County, with a population of 258.
There are 37 cities in Lake County, Indiana.