3 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Aberdeen | 1 | 19,541 | 16,270 | 2.87% | 2,807 | 7 | City |
| Havre de Grace | 2 | 15,415 | 14,835 | 0.63% | 2,594 | 6 | City |
| Bel Air | 3 | 10,243 | 10,698 | -0.74% | 3,379 | 3 | Town |
Aberdeen is the largest city in Harford County, with a population of 19,541.
Bel Air is the smallest city in Harford County, with a population of 10,243.
There are 3 cities in Harford County, Maryland.