| County | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Sussex County | 1 | 18.61% | 283,047 | 238,627 |
| Kent County | 2 | 7.88% | 196,696 | 182,322 |
| New Castle County | 3 | 3.34% | 590,038 | 570,941 |
Delaware's counties show varied growth patterns from 2020 to 2026. Sussex County leads with 2.89% annualized growth, followed by Kent County (1.27%) and New Castle County (0.55%). The largest counties are New Castle County (590,038), Sussex County (283,047), and Kent County (196,696). All 3 counties in Delaware are growing. Overall, counties averaged 1.57% annualized growth, with total population growing by 1.27% annually.
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