30 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Leesburg | 1 | 49,932 | 48,382 | 0.62% | 3,968 | 12.59 | Town |
| Ashburn | 2 | 45,971 | 44,090 | 0.36% | 3,006 | 15.29 | CDP |
| South Riding | 3 | 35,634 | 32,526 | 2.18% | 5,206 | 6.84 | CDP |
| Sterling | 4 | 31,867 | 30,872 | 0.85% | 5,843 | 5.45 | CDP |
| Brambleton | 5 | 26,034 | 20,843 | 4.33% | 4,524 | 5.75 | CDP |
| Stone Ridge | 6 | 18,258 | 15,034 | 4.2% | 7,063 | 2.58 | CDP |
| Broadlands | 7 | 15,149 | 14,146 | 1.26% | 4,686 | 3.23 | CDP |
| Lansdowne | 8 | 13,237 | 12,679 | 1.01% | 3,274 | 4.04 | CDP |
| Sugarland Run | 9 | 13,073 | 12,656 | 0.65% | 6,507 | 2.01 | CDP |
| Cascades | 10 | 12,700 | 12,132 | 0.42% | 3,445 | 3.69 | CDP |
| Loudoun Valley Estates | 11 | 12,228 | 9,673 | 4.9% | 4,359 | 2.81 | CDP |
| Lowes Island | 12 | 11,392 | 11,319 | 0.37% | 3,776 | 3.02 | CDP |
| Belmont | 13 | 10,869 | 9,341 | 3.1% | 4,024 | 2.70 | CDP |
| Countryside | 14 | 9,540 | 9,517 | -0.37% | 3,716 | 2.57 | CDP |
| Purcellville | 15 | 8,911 | 8,943 | -0.07% | 2,632 | 3.38 | Town |
| Moorefield | 16 | 6,864 | 4,099 | 7.15% | 6,042 | 1.14 | CDP |
| Dulles Town Center | 17 | 6,205 | 5,362 | 1.75% | 2,583 | 2.40 | CDP |
| University Center | 18 | 4,382 | 3,878 | 1.22% | 4,773 | 0.92 | CDP |
| One Loudoun | 19 | 3,474 | 2,151 | 7.16% | 5,479 | 0.63 | CDP |
| Arcola | 20 | 2,988 | 1,761 | 6.56% | 1,308 | 2.29 | CDP |
| Goose Creek Village | 21 | 2,915 | 2,193 | 7.13% | 7,712 | 0.38 | CDP |
| Oak Grove | 22 | 2,722 | 2,863 | 2.37% | 2,328 | 1.17 | CDP |
| Lovettsville | 23 | 2,706 | 2,708 | 0% | 3,034 | 0.89 | Town |
| Round Hill | 24 | 681 | 695 | -0.44% | 1,856 | 0.37 | Town |
| Middleburg | 25 | 679 | 671 | 0.3% | 655 | 1.04 | Town |
| Hamilton | 26 | 599 | 618 | -0.66% | 2,698 | 0.22 | Town |
| Kincora | 27 | 396 | 13 | 7.03% | 739 | 0.54 | CDP |
| Waterford | 28 | 310 | 256 | 7.27% | 856 | 0.36 | CDP |
| Aldie | 29 | 264 | 233 | 7.32% | 1,091 | 0.24 | CDP |
| Hillsboro | 30 | 109 | 116 | -0.91% | 411 | 0.27 | Town |
Leesburg is the largest city in Loudoun County, with a population of 49,932.
Hillsboro is the smallest city in Loudoun County.
There are 30 cities in Loudoun County, Virginia.