3 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Aberdeen | 1 | 18,996 | 16,270 | 2.95% | 2,729 | 7 | City |
| Havre de Grace | 2 | 15,318 | 14,835 | 0.63% | 2,578 | 6 | City |
| Bel Air | 3 | 10,319 | 10,698 | -0.73% | 3,404 | 3 | Town |
Aberdeen is the largest city in Harford County, with a population of 18,996.
Bel Air is the smallest city in Harford County, with a population of 10,319.
There are 3 cities in Harford County, Maryland.