21 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Grove | 1 | 7,518 | 6,955 | 1.53% | 791 | 9.50 | City |
| Jay | 2 | 2,484 | 2,419 | 0.53% | 745 | 3.33 | City |
| Kenwood | 3 | 1,293 | 1,017 | 0.39% | 29 | 45.06 | CDP |
| Wickliffe | 4 | 1,036 | 795 | 7.13% | 110 | 9.38 | CDP |
| Colcord | 5 | 769 | 728 | 1.05% | 314 | 2.45 | Town |
| Kansas | 6 | 764 | 714 | 1.33% | 375 | 2.04 | Town |
| Twin Oaks | 7 | 349 | 382 | 2.95% | 65 | 5.34 | CDP |
| New Eucha | 8 | 311 | 399 | -2.2% | 40 | 7.77 | CDP |
| Oaks | 9 | 275 | 269 | 0.36% | 321 | 0.86 | Town |
| Dennis | 10 | 219 | 91 | 0.92% | 48 | 4.53 | CDP |
| Zena | 11 | 187 | 147 | 2.19% | 39 | 4.76 | CDP |
| Oak Hill-Piney | 12 | 179 | 128 | 7.19% | 67 | 2.66 | CDP |
| Cayuga | 13 | 153 | 152 | 0.66% | 22 | 7.05 | CDP |
| Pump Back | 14 | 129 | 147 | -2.27% | 62 | 2.07 | CDP |
| Brush Creek | 15 | 128 | 119 | 7.56% | 156 | 0.82 | CDP |
| Drowning Creek | 16 | 122 | 165 | -2.4% | 137 | 0.89 | CDP |
| Deer Lick | 17 | 115 | 97 | 7.48% | 121 | 0.95 | CDP |
| White Water | 18 | 46 | 150 | 6.98% | 38 | 1.20 | CDP |
| Sycamore | 19 | 41 | 0 | -18% | 14 | 2.98 | CDP |
| Dodge | 20 | 24 | 39 | -20% | 4 | 6.59 | CDP |
| Old Eucha | 21 | 20 | 31 | 5.26% | 6 | 3.10 | CDP |
Grove is the largest city in Delaware County, with a population of 7,518.
Old Eucha is the smallest city in Delaware County.
There are 21 cities in Delaware County, Oklahoma.