19 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Jacksonville | 1 | 17,579 | 18,245 | -0.63% | 1,664 | 11 | City |
| South Jacksonville | 2 | 3,149 | 3,292 | -0.76% | 1,392 | 2 | Village |
| Franklin | 3 | 2,195 | 2,229 | -0.05% | 61 | 36 | Township |
| Concord | 4 | 1,394 | 1,456 | -0.78% | 39 | 36 | Township |
| Waverly | 5 | 1,127 | 1,186 | -0.88% | 1,088 | 1 | City |
| Meredosia | 6 | 782 | 817 | -0.76% | 905 | 1 | Village |
| Franklin | 7 | 580 | 610 | -0.85% | 700 | 1 | Village |
| Murrayville | 8 | 537 | 563 | -0.74% | 1,083 | 0 | Village |
| Woodson | 9 | 477 | 497 | -0.63% | 1,211 | 0 | Village |
| Chapin | 10 | 454 | 477 | -0.87% | 455 | 1 | Village |
| Concord | 11 | 372 | 375 | 0.81% | 9 | 40 | Township |
| Concord | 12 | 283 | 292 | -0.35% | 8 | 37 | Township |
| Curran | 13 | 209 | 212 | 0% | 106 | 2 | Village |
| Concord | 14 | 150 | 156 | -0.66% | 602 | 0 | Village |
| Berlin | 15 | 141 | 143 | 0% | 158 | 1 | Village |
| Glasgow | 16 | 105 | 111 | -0.94% | 104 | 1 | Village |
| Naples | 17 | 95 | 101 | -1.04% | 157 | 1 | Town |
| Lynnville | 18 | 90 | 95 | -1.1% | 1,169 | 0 | Village |
| Exeter | 19 | 82 | 87 | -1.2% | 119 | 1 | Village |
Jacksonville is the largest city in Morgan County, with a population of 17,579.
Exeter is the smallest city in Morgan County, with a population of 82.
There are 19 cities in Morgan County, Illinois.