Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Grove | 1 | 7,405 | 6,955 | 1.54% | 780 | 9.5 | City |
| Jay | 2 | 2,471 | 2,419 | 0.53% | 742 | 3.3 | City |
| Kenwood | 3 | 1,288 | 1,017 | 0.31% | 29 | 45.1 | CDP |
| Wickliffe | 4 | 967 | 795 | 7.68% | 103 | 9.4 | CDP |
| Colcord | 5 | 761 | 728 | 1.06% | 310 | 2.5 | Town |
| Kansas | 6 | 754 | 714 | 1.34% | 370 | 2.0 | Town |
| Twin Oaks | 7 | 339 | 382 | 3.04% | 64 | 5.3 | CDP |
| New Eucha | 8 | 318 | 399 | -1.85% | 41 | 7.8 | CDP |
| Oaks | 9 | 274 | 269 | 0.37% | 320 | 0.9 | Town |
| Dennis | 10 | 217 | 91 | 0.46% | 48 | 4.5 | CDP |
| Zena | 11 | 183 | 147 | 2.81% | 38 | 4.8 | CDP |
| Oak Hill-Piney | 12 | 167 | 128 | 7.74% | 63 | 2.7 | CDP |
| Cayuga | 13 | 152 | 152 | 0.66% | 22 | 7.1 | CDP |
| Pump Back | 14 | 132 | 147 | -2.22% | 64 | 2.1 | CDP |
| Drowning Creek | 15 | 125 | 165 | -1.57% | 141 | 0.9 | CDP |
| Brush Creek | 16 | 119 | 119 | 8.18% | 145 | 0.8 | CDP |
| Deer Lick | 17 | 107 | 97 | 7% | 112 | 1.0 | CDP |
| Sycamore | 18 | 50 | 0 | -15.25% | 17 | 3.0 | CDP |
| White Water | 19 | 43 | 150 | 7.5% | 36 | 1.2 | CDP |
| Dodge | 20 | 30 | 39 | -16.67% | 5 | 6.6 | CDP |
| Old Eucha | 21 | 19 | 31 | 11.77% | 6 | 3.1 | CDP |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Grove is the largest city in Delaware County.
Old Eucha is the smallest city in Delaware County.
There are 21 cities in Delaware County, Oklahoma.