15 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lawrence | 1 | 6,192 | 6,193 | 0.18% | 148 | 42 | Township |
| Lawrenceville | 2 | 4,345 | 4,193 | 0.7% | 2,008 | 2 | City |
| Christy | 3 | 3,053 | 3,140 | -0.52% | 90 | 34 | Township |
| Sumner | 4 | 2,585 | 2,638 | -0.42% | 1,849 | 1 | City |
| Bridgeport | 5 | 2,136 | 2,319 | -1.34% | 134 | 16 | Township |
| Bridgeport | 6 | 1,657 | 1,802 | -1.72% | 1,546 | 1 | City |
| Denison | 7 | 1,234 | 1,356 | -1.67% | 21 | 58 | Township |
| Sumner | 8 | 819 | 831 | -0.12% | 22 | 37 | Township |
| Petty | 9 | 583 | 634 | -1.52% | 10 | 57 | Township |
| Bond | 10 | 534 | 583 | -1.48% | 15 | 35 | Township |
| St. Francisville | 11 | 516 | 569 | -2.09% | 693 | 1 | City |
| Sumner | 12 | 473 | 500 | -0.63% | 13 | 37 | Township |
| Lukin | 13 | 379 | 412 | -1.56% | 8 | 50 | Township |
| Allison | 14 | 250 | 257 | -0.79% | 6 | 45 | Township |
| Russellville | 15 | 86 | 95 | -2.27% | 215 | 0 | Village |
Lawrence is the largest city in Lawrence County, with a population of 6,192.
Russellville is the smallest city in Lawrence County, with a population of 86.
There are 15 cities in Lawrence County, Illinois.