| County | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Sussex County | 1 | 19.61% | 285,452 | 238,654 |
| Kent County | 2 | 8.51% | 197,824 | 182,317 |
| New Castle County | 3 | 5.02% | 599,629 | 570,957 |
Delaware's counties show varied growth patterns from 2020 to 2026. Sussex County leads with 3.03% annualized growth, followed by Kent County (1.37%) and New Castle County (0.82%). The largest counties are New Castle County (599,629), Sussex County (285,452), and Kent County (197,824). All 3 counties in Delaware are growing. Overall, counties averaged 1.74% annualized growth, with total population growing by 1.47% annually.
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