7 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Leesburg | 1 | 50,525 | 48,443 | 0.69% | 4,015 | 13 | Town |
| Purcellville | 2 | 8,974 | 8,946 | 0.06% | 2,651 | 3 | Town |
| Lovettsville | 3 | 2,724 | 2,709 | 0.11% | 3,054 | 1 | Town |
| Middleburg | 4 | 707 | 673 | 0.86% | 682 | 1 | Town |
| Round Hill | 5 | 684 | 692 | -0.15% | 1,230 | 1 | Town |
| Hamilton | 6 | 602 | 617 | -0.33% | 2,712 | 0 | Town |
| Hillsboro | 7 | 108 | 113 | -0.92% | 408 | 0 | Town |
Leesburg is the largest city in Loudoun County, with a population of 50,525.
Hillsboro is the smallest city in Loudoun County, with a population of 108.
There are 7 cities in Loudoun County, Virginia.