| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Leesburg | 1 | 50,270 | 48,433 | 0.71% | 3,994 | 13 | Town |
| Purcellville | 2 | 8,895 | 8,944 | 0.06% | 2,628 | 3 | Town |
| Lovettsville | 3 | 2,712 | 2,708 | 0.15% | 3,040 | 1 | Town |
| Middleburg | 4 | 705 | 673 | 0.86% | 680 | 1 | Town |
| Round Hill | 5 | 702 | 700 | 0% | 1,263 | 1 | Town |
| Hamilton | 6 | 606 | 619 | -0.33% | 2,730 | 0 | Town |
| Hillsboro | 7 | 111 | 116 | -0.89% | 419 | 0 | Town |
Leesburg is the largest city in Loudoun County, with a population of 50,270.
Hillsboro is the smallest city in Loudoun County, with a population of 111.
There are 7 cities in Loudoun County, Virginia.