12 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Bonham | 1 | 11,173 | 10,437 | 1.33% | 1,136 | 9.83 | City |
| Leonard | 2 | 2,143 | 1,992 | 1.42% | 936 | 2.29 | City |
| Honey Grove | 3 | 1,806 | 1,718 | 1.01% | 605 | 2.98 | City |
| Ivanhoe | 4 | 1,407 | 1,331 | 1.08% | 442 | 3.18 | City |
| Trenton | 5 | 859 | 748 | 2.63% | 459 | 1.87 | City |
| Ector | 6 | 805 | 739 | 1.64% | 686 | 1.17 | City |
| Savoy | 7 | 777 | 716 | 1.57% | 976 | 0.80 | City |
| Ladonia | 8 | 635 | 599 | 1.11% | 319 | 1.99 | Town |
| Dodd City | 9 | 405 | 370 | 1.76% | 229 | 1.77 | Town |
| Bailey | 10 | 241 | 223 | 1.69% | 606 | 0.40 | City |
| Windom | 11 | 199 | 191 | 1.01% | 362 | 0.55 | Town |
| Ravenna | 12 | 194 | 176 | 2.1% | 161 | 1.20 | City |
Bonham is the largest city in Fannin County, with a population of 11,173.
Ravenna is the smallest city in Fannin County.
There are 12 cities in Fannin County, Texas.