15 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lawrence | 1 | 6,203 | 6,193 | 0.18% | 148 | 42 | Township |
| Lawrenceville | 2 | 4,376 | 4,193 | 0.71% | 2,022 | 2 | City |
| Christy | 3 | 3,037 | 3,140 | -0.52% | 90 | 34 | Township |
| Sumner | 4 | 2,575 | 2,638 | -0.39% | 1,842 | 1 | City |
| Bridgeport | 5 | 2,107 | 2,319 | -1.36% | 132 | 16 | Township |
| Bridgeport | 6 | 1,628 | 1,802 | -1.75% | 1,519 | 1 | City |
| Denison | 7 | 1,213 | 1,356 | -1.7% | 21 | 58 | Township |
| Sumner | 8 | 818 | 831 | -0.12% | 22 | 37 | Township |
| Petty | 9 | 574 | 634 | -1.54% | 10 | 57 | Township |
| Bond | 10 | 526 | 583 | -1.5% | 15 | 35 | Township |
| St. Francisville | 11 | 506 | 569 | -1.94% | 679 | 1 | City |
| Sumner | 12 | 470 | 500 | -0.63% | 13 | 37 | Township |
| Lukin | 13 | 373 | 412 | -1.58% | 8 | 50 | Township |
| Allison | 14 | 248 | 257 | -0.8% | 6 | 45 | Township |
| Russellville | 15 | 84 | 95 | -2.33% | 210 | 0 | Village |
Lawrence is the largest city in Lawrence County, with a population of 6,203.
Russellville is the smallest city in Lawrence County, with a population of 84.
There are 15 cities in Lawrence County, Illinois.