25 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Grove | 1 | 7,420 | 6,952 | 1.27% | 781 | 9 | City |
| Grove | 2 | 7,420 | 6,954 | 1.27% | 781 | 9 | City |
| Jay | 3 | 2,487 | 2,422 | 0.53% | 746 | 3 | City |
| Jay | 4 | 2,487 | 2,420 | 0.53% | 746 | 3 | City |
| Kenwood | 5 | 1,293 | 1,017 | 0.39% | 29 | 45 | CDP |
| Wickliffe | 6 | 1,036 | 795 | 7.14% | 110 | 9 | CDP |
| Kansas | 7 | 763 | 709 | 1.33% | 374 | 2 | Town |
| Kansas | 8 | 763 | 711 | 1.33% | 374 | 2 | Town |
| Colcord | 9 | 759 | 727 | 0.8% | 310 | 2 | Town |
| Colcord | 10 | 759 | 726 | 0.8% | 310 | 2 | Town |
| Twin Oaks | 11 | 349 | 382 | 2.95% | 65 | 5 | CDP |
| New Eucha | 12 | 311 | 399 | -2.2% | 40 | 8 | CDP |
| Oaks | 13 | 268 | 268 | 0% | 313 | 1 | Town |
| Oaks | 14 | 268 | 268 | 0% | 313 | 1 | Town |
| Dennis | 15 | 219 | 91 | 0.92% | 48 | 5 | CDP |
| Zena | 16 | 187 | 147 | 2.19% | 39 | 5 | CDP |
| Oak Hill-Piney | 17 | 179 | 128 | 7.19% | 67 | 3 | CDP |
| Cayuga | 18 | 153 | 152 | 0.66% | 22 | 7 | CDP |
| Pump Back | 19 | 129 | 147 | -2.27% | 62 | 2 | CDP |
| Brush Creek | 20 | 128 | 119 | 7.56% | 156 | 1 | CDP |
| Drowning Creek | 21 | 122 | 165 | -2.4% | 137 | 1 | CDP |
| Deer Lick | 22 | 115 | 97 | 7.48% | 121 | 1 | CDP |
| White Water | 23 | 46 | 150 | 6.98% | 38 | 1 | CDP |
| Dodge | 24 | 24 | 39 | -20% | 4 | 7 | CDP |
| Old Eucha | 25 | 20 | 31 | 5.26% | 6 | 3 | CDP |
Grove is the largest city in Delaware County, with a population of 7,420.
Old Eucha is the smallest city in Delaware County, with a population of 20.
There are 25 cities in Delaware County, Oklahoma.