Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hammond | 1 | 75,669 | 77,763 | -0.69% | 3,327 | 22.7 | City |
| Gary | 2 | 67,199 | 69,009 | -0.67% | 1,346 | 49.9 | City |
| Merrillville | 3 | 36,310 | 36,457 | -0.1% | 1,093 | 33.2 | Town |
| Crown Point | 4 | 35,179 | 33,998 | 0.85% | 1,850 | 19.0 | City |
| Schererville | 5 | 29,655 | 29,661 | -0.01% | 1,963 | 15.1 | Town |
| Hobart | 6 | 29,305 | 29,717 | -0.35% | 1,119 | 26.2 | City |
| East Chicago | 7 | 25,659 | 26,342 | -0.66% | 1,818 | 14.1 | City |
| St. John | 8 | 24,686 | 20,516 | 4.41% | 1,938 | 12.7 | Town |
| Munster | 9 | 23,523 | 23,887 | -0.39% | 3,121 | 7.5 | Town |
| Highland | 10 | 23,379 | 23,962 | -0.62% | 3,376 | 6.9 | Town |
| Cedar Lake | 11 | 16,694 | 14,190 | 3.9% | 1,814 | 9.2 | Town |
| Dyer | 12 | 16,277 | 16,500 | -0.34% | 2,644 | 6.2 | Town |
| Griffith | 13 | 16,121 | 16,525 | -0.62% | 2,075 | 7.8 | Town |
| Lake Station | 14 | 12,974 | 13,266 | -0.56% | 1,564 | 8.3 | City |
| Lowell | 15 | 11,416 | 10,707 | 1.57% | 1,626 | 7.0 | Town |
| Winfield | 16 | 8,310 | 7,249 | 3.29% | 670 | 12.4 | Town |
| Lakes Four Seasons | 17 | 7,682 | 7,081 | 0.62% | 3,372 | 2.3 | CDP |
| Highland | 18 | 5,774 | 5,276 | 1.62% | 2,546 | 2.3 | CDP |
| Whiting | 19 | 4,484 | 4,571 | -0.49% | 2,481 | 1.8 | City |
| New Chicago | 20 | 1,949 | 1,997 | -0.61% | 2,896 | 0.7 | Town |
| Lake Dalecarlia | 21 | 1,464 | 1,779 | 0.55% | 1,298 | 1.1 | CDP |
| Shelby | 22 | 270 | 370 | -6.57% | 210 | 1.3 | CDP |
| Schneider | 23 | 258 | 268 | -1.15% | 300 | 0.9 | Town |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Hammond is the largest city in Lake County.
Schneider is the smallest city in Lake County.
There are 23 cities in Lake County, Indiana.