| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lawrenceville | 1 | 4,389 | 4,187 | 0.76% | 2,028 | 2 | City |
| Bridgeport | 2 | 1,623 | 1,796 | -1.76% | 1,514 | 1 | City |
| Sumner | 3 | 1,380 | 2,635 | -16.67% | 987 | 1 | City |
| St. Francisville | 4 | 512 | 569 | -1.92% | 687 | 1 | City |
| Russellville | 5 | 89 | 100 | -2.2% | 223 | 0 | Village |
Lawrenceville is the largest city in Lawrence County, with a population of 4,389.
Russellville is the smallest city in Lawrence County, with a population of 89.
There are 5 cities in Lawrence County, Illinois.