| 1 | Cedar Lake town (southwest) | 8,182 |
| 2 | Schneider town | 7,757 |
| 3 | Winfield town (south) | 7,625 |
| 4 | Lowell town | 7,599 |
| 5 | Schererville town (northeast) | 7,387 |
| 6 | Crown Point city (south-southwest) | 6,833 |
| 7 | Hobart city (east-southeast) | 6,777 |
| 8 | Griffith town (south 1) | 6,671 |
| 9 | New Chicago town (east-southeast) | 6,526 |
| 10 | Crown Point city (east-northeast) | 6,443 |
| 11 | Merrillville town (west-southwest) | 6,441 |
| 12 | Lake Station city (southeast) | 6,407 |
| 13 | Schererville town (south-southeast) | 6,362 |
| 14 | Hobart city (west 2) | 6,208 |
| 15 | Cedar Lake town (west) | 6,172 |
| 16 | Ross CDP (south) | 6,021 |
| 17 | Munster town (south-southeast 1) | 5,678 |
| 18 | East Chicago city (southwest 2) | 5,641 |
| 19 | Dyer town (south) | 5,621 |
| 20 | Lakes of the Four Seasons CDP | 5,612 |
| 21 | Schererville town (west) | 5,583 |
| 22 | Munster town (south-southeast 2) | 5,524 |
| 23 | Hammond city (north-northwest) | 5,432 |
| 24 | Hammond city (south 1) | 5,365 |
| 25 | East Chicago city (south-southwest 2) | 5,306 |
| 26 | Shelby CDP (west-southwest) | 5,293 |
| 27 | Dyer town (west) | 5,266 |
| 28 | St. John town (east 2) | 5,249 |
| 29 | East Chicago city (west-southwest 2) | 5,030 |
| 30 | Lake Station city (south-southwest) | 4,923 |
| 31 | Griffith town (north 1) | 4,909 |
| 32 | Hammond city (north 1) | 4,900 |
| 33 | Highland town (north-northeast) | 4,898 |
| 34 | St. John town (west-southwest) | 4,890 |
| 35 | Munster town (north) | 4,844 |
| 36 | New Chicago town (east) | 4,814 |
| 37 | Dyer town (east) | 4,761 |
| 38 | East Chicago city (south) | 4,734 |
| 39 | Hobart city (east-northeast) | 4,598 |
| 40 | St. John town (west-northwest 1) | 4,587 |
| 41 | St. John town (west-northwest 2) | 4,568 |
| 42 | Hammond city (south 2) | 4,543 |
| 43 | Merrillville town (north-northeast 1) | 4,539 |
| 44 | Munster town (west-southwest) | 4,520 |
| 45 | St. John town (southwest) | 4,498 |
| 46 | Griffith town (south 2) | 4,489 |
| 47 | Dyer town (south-southeast) | 4,450 |
| 48 | Crown Point city (south-southeast) | 4,446 |
| 49 | Gary city (west-southwest 1) | 4,444 |
| 50 | Dyer town (north) | 4,370 |
| 51 | East Chicago city (southwest 1) | 4,327 |
| 52 | Merrillville town (northwest) | 4,318 |
| 53 | Winfield town (north) | 4,316 |
| 54 | Gary city (west-southwest 2) | 4,262 |
| 55 | Ross CDP (east) | 4,218 |
| 56 | St. John town (north) | 4,159 |
| 57 | St. John town (east-southeast) | 4,146 |
| 58 | Highland town (southeast) | 4,145 |
| 59 | Highland town (west-southwest) | 4,140 |
| 60 | Crown Point city (west) | 4,130 |
| 61 | East Chicago city (west-southwest 1) | 4,092 |
| 62 | Crown Point city (north-northeast 1) | 3,982 |
| 63 | New Chicago town (west-southwest 2) | 3,942 |
| 64 | Cedar Lake town (southeast) | 3,932 |
| 65 | Munster town (east-southeast) | 3,931 |
| 66 | Merrillville town (southwest) | 3,893 |
| 67 | East Chicago city (northwest 3) | 3,821 |
| 68 | Schererville town (northwest) | 3,719 |
| 69 | Hammond city (east-southeast) | 3,696 |
| 70 | East Chicago city (east 1) | 3,687 |
| 71 | Munster town (south-southwest) | 3,641 |
| 72 | East Chicago city (northwest 4) | 3,629 |
| 73 | Munster town (east-northeast) | 3,629 |
| 74 | Munster town (north-northwest) | 3,611 |
| 75 | Munster town (north-northeast) | 3,602 |
| 76 | Merrillville town (south-southeast) | 3,589 |
| 77 | Highland town (east-northeast) | 3,573 |
| 78 | Hammond city (south-southeast) | 3,496 |
| 79 | East Chicago city (south-southeast) | 3,468 |
| 80 | Crown Point city (west-northwest) | 3,465 |
| 81 | Cedar Lake town (northeast) | 3,351 |
| 82 | East Chicago city (northwest 2) | 3,297 |
| 83 | Gary city (northwest) | 3,268 |
| 84 | East Chicago city (south-southwest 1) | 3,236 |
| 85 | Merrillville town (southeast) | 3,204 |
| 86 | Schererville town (east-southeast) | 3,187 |
| 87 | Highland town (south-southwest) | 3,062 |
| 88 | Whiting city (west-northwest) | 2,979 |
| 89 | Ross CDP (west-southwest) | 2,974 |
| 90 | Lake Station city (north-northeast) | 2,918 |
| 91 | St. John town (east 1) | 2,899 |
| 92 | Munster town (northwest 1) | 2,786 |
| 93 | Hobart city (west 1) | 2,784 |
| 94 | Merrillville town (east) | 2,752 |
| 95 | Munster town (northwest 2) | 2,723 |
| 96 | East Chicago city (east 2) | 2,690 |
| 97 | Ross CDP (north-northwest) | 2,688 |
| 98 | Hammond city (north 2) | 2,687 |
| 99 | New Chicago town (west-southwest 1) | 2,661 |
| 100 | Merrillville town (north-northeast 2) | 2,510 |
| 101 | Ross CDP (west-northwest) | 2,469 |
| 102 | Lake Station city (northwest) | 2,357 |
| 103 | Crown Point city (north-northeast 2) | 2,338 |
| 104 | East Chicago city (east-southeast) | 2,233 |
| 105 | Hammond city (south-southwest) | 2,144 |
| 106 | New Chicago town (south-southwest) | 2,096 |
| 107 | Gary city (north) | 1,969 |
| 108 | Shelby CDP (east-northeast) | 1,957 |
| 109 | Gary city (east 1) | 1,916 |
| 110 | Griffith town (north 2) | 1,876 |
| 111 | New Chicago town (north-northeast) | 1,841 |
| 112 | East Chicago city (east 3) | 1,737 |
| 113 | East Chicago city (west) | 1,709 |
| 114 | Whiting city (east-southeast) | 1,575 |
| 115 | Gary city (west) | 1,556 |
| 116 | East Chicago city (north-northwest 3) | 1,505 |
| 117 | Gary city (north-northeast) | 1,308 |
| 118 | Ross CDP (east-southeast) | 1,297 |
| 119 | Gary city (south-southwest) | 1,279 |
| 120 | Gary city (east-southeast) | 1,245 |
| 121 | Gary city (south-southeast) | 1,239 |
| 122 | East Chicago city (northwest 1) | 1,207 |
| 123 | East Chicago city (north-northwest 1) | 1,144 |
| 124 | East Chicago city (north-northwest 2) | 1,120 |
| 125 | Gary city (northeast 2) | 964 |
| 126 | Gary city (west-northwest) | 912 |
| 127 | Gary city (south) | 821 |
| 128 | Gary city (northeast 1) | 741 |
| 129 | New Chicago town (north-northwest) | 717 |
| 130 | Gary city (east 2) | 504 |
| 131 | Gary city (southeast) | 263 |