15 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sullivan | 1 | 6,251 | 6,282 | 0.61% | 105 | 59 | Township |
| Sullivan | 2 | 4,272 | 4,401 | -0.6% | 1,543 | 3 | City |
| Lowe | 3 | 1,762 | 1,743 | 0.23% | 43 | 41 | Township |
| Marrowbone | 4 | 1,562 | 1,610 | -0.19% | 40 | 39 | Township |
| Lovington | 5 | 1,519 | 1,556 | -0.2% | 29 | 52 | Township |
| Bethany | 6 | 1,185 | 1,250 | -1.09% | 1,213 | 1 | Village |
| Jonathan Creek | 7 | 1,036 | 1,018 | 0.19% | 28 | 37 | Township |
| Lovington | 8 | 1,009 | 1,062 | -1.08% | 1,855 | 1 | Village |
| East Nelson | 9 | 1,004 | 994 | 0.1% | 28 | 36 | Township |
| Dora | 10 | 682 | 699 | -0.15% | 19 | 35 | Township |
| Sullivan | 11 | 644 | 656 | 0.16% | 16 | 41 | Township |
| Whitley | 12 | 587 | 590 | 0% | 16 | 37 | Township |
| Dalton City | 13 | 431 | 456 | -1.15% | 807 | 1 | Village |
| Gays | 14 | 208 | 221 | -1.42% | 539 | 0 | Village |
| LaPlace | 15 | 122 | 128 | -6.87% | 187 | 1 | CDP |
Sullivan is the largest city in Moultrie County, with a population of 6,251.
LaPlace is the smallest city in Moultrie County, with a population of 122.
There are 15 cities in Moultrie County, Illinois.