24 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Jacksonville | 1 | 17,003 | 17,588 | -0.68% | 1,610 | 10.56 | City |
| South Jacksonville | 2 | 3,159 | 3,293 | -0.85% | 1,396 | 2.26 | Village |
| Franklin | 3 | 2,165 | 2,231 | -0.64% | 60 | 35.87 | Township |
| Concord | 4 | 1,421 | 1,456 | -0.28% | 39 | 36.01 | Township |
| Waverly | 5 | 1,138 | 1,188 | -0.87% | 1,098 | 1.04 | City |
| Meredosia | 6 | 788 | 822 | -0.88% | 912 | 0.86 | Village |
| Franklin | 7 | 585 | 610 | -0.85% | 706 | 0.83 | Village |
| Murrayville | 8 | 541 | 566 | -0.92% | 1,091 | 0.50 | Village |
| Woodson | 9 | 479 | 498 | -0.83% | 1,216 | 0.39 | Village |
| Chapin | 10 | 453 | 475 | -0.88% | 454 | 1 | Village |
| Concord | 11 | 360 | 375 | -0.83% | 9 | 40.39 | Township |
| Alexander | 12 | 340 | 159 | 7.26% | 346 | 0.98 | CDP |
| Concord | 13 | 284 | 292 | -0.35% | 8 | 37.19 | Township |
| Curran | 14 | 208 | 212 | -0.48% | 105 | 1.98 | Village |
| Concord | 15 | 150 | 155 | -0.66% | 602 | 0.25 | Village |
| Berlin | 16 | 142 | 144 | 0% | 159 | 0.89 | Village |
| Literberry | 17 | 121 | 78 | 7.08% | 149 | 0.81 | CDP |
| Glasgow | 18 | 104 | 113 | -1.89% | 103 | 1.01 | Village |
| Lynnville | 19 | 93 | 97 | -1.06% | 1,208 | 0.08 | Village |
| Naples | 20 | 92 | 101 | -2.13% | 152 | 0.60 | Town |
| Exeter | 21 | 80 | 87 | -1.23% | 116 | 0.69 | Village |
| Oxville | 22 | 29 | 18 | 7.41% | 853 | 0.03 | CDP |
| Riggston | 23 | 22 | 15 | 4.76% | 846 | 0.03 | CDP |
| Merritt | 24 | 21 | 26 | 5% | 538 | 0.04 | CDP |
Jacksonville is the largest city in Morgan County, with a population of 17,003.
Merritt is the smallest city in Morgan County, with a population of 21.
There are 24 cities in Morgan County, Illinois.