| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Aberdeen | 1 | 18,715 | 16,286 | 1.86% | 2,688 | 7 | City |
| Havre de Grace | 2 | 15,742 | 14,847 | 0.72% | 2,649 | 6 | City |
| Bel Air | 3 | 10,473 | 10,686 | -0.32% | 3,455 | 3 | Town |
Aberdeen is the largest city in Harford County, with a population of 18,715.
Bel Air is the smallest city in Harford County, with a population of 10,473.
There are 3 cities in Harford County, Maryland.