7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Leesburg | 1 | 50,178 | 48,443 | 0.7% | 3,987 | 13 | Town |
| Purcellville | 2 | 8,969 | 8,946 | 0.04% | 2,650 | 3 | Town |
| Lovettsville | 3 | 2,721 | 2,709 | 0.07% | 3,050 | 1 | Town |
| Middleburg | 4 | 701 | 673 | 0.72% | 676 | 1 | Town |
| Round Hill | 5 | 685 | 692 | -0.29% | 1,232 | 1 | Town |
| Hamilton | 6 | 604 | 617 | -0.49% | 2,721 | 0 | Town |
| Hillsboro | 7 | 109 | 113 | -0.91% | 411 | 0 | Town |
Leesburg is the largest city in Loudoun County, with a population of 50,178.
Hillsboro is the smallest city in Loudoun County, with a population of 109.
There are 7 cities in Loudoun County, Virginia.