| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sherman | 1 | 54,008 | 43,984 | 3.04% | 1,163 | 46 | City |
| Denison | 2 | 27,325 | 24,562 | 1.88% | 942 | 29 | City |
| Van Alstyne | 3 | 8,701 | 4,461 | 8.6% | 1,564 | 6 | City |
| Whitesboro | 4 | 4,209 | 4,084 | 0.5% | 1,260 | 3 | City |
| Howe | 5 | 3,697 | 3,616 | 0.3% | 741 | 5 | Town |
| Pottsboro | 6 | 2,837 | 2,490 | 2.53% | 899 | 3 | Town |
| Gunter | 7 | 2,682 | 2,076 | 4.2% | 138 | 19 | City |
| Collinsville | 8 | 2,120 | 1,875 | 2.12% | 2,146 | 1 | Town |
| Whitewright | 9 | 1,757 | 1,732 | 0.46% | 959 | 2 | Town |
| Bells | 10 | 1,526 | 1,520 | 0.07% | 719 | 2 | Town |
| Tioga | 11 | 1,335 | 1,161 | 2.53% | 678 | 2 | Town |
| Southmayd | 12 | 1,133 | 993 | 2.07% | 402 | 3 | City |
| Tom Bean | 13 | 983 | 932 | 0.82% | 679 | 1 | City |
| Knollwood | 14 | 821 | 766 | 1.48% | 2,526 | 0 | City |
| Sadler | 15 | 364 | 371 | -0.27% | 344 | 1 | City |
| Dorchester | 16 | 100 | 89 | 2.04% | 67 | 1 | City |
Sherman is the largest city in Grayson County, with a population of 54,008.
Dorchester is the smallest city in Grayson County, with a population of 100.
There are 16 cities in Grayson County, Texas.