Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Leesburg | 1 | 49,622 | 48,382 | 0.63% | 3,943 | 12.6 | Town |
| Ashburn | 2 | 45,807 | 44,090 | 0.36% | 2,995 | 15.3 | CDP |
| South Riding | 3 | 34,875 | 32,526 | 2.23% | 5,095 | 6.8 | CDP |
| Sterling | 4 | 31,597 | 30,872 | 0.86% | 5,793 | 5.5 | CDP |
| Brambleton | 5 | 24,954 | 20,843 | 4.52% | 4,336 | 5.8 | CDP |
| Stone Ridge | 6 | 17,522 | 15,034 | 4.39% | 6,778 | 2.6 | CDP |
| Broadlands | 7 | 14,960 | 14,146 | 1.28% | 4,627 | 3.2 | CDP |
| Lansdowne | 8 | 13,104 | 12,679 | 1.02% | 3,241 | 4.0 | CDP |
| Sugarland Run | 9 | 12,988 | 12,656 | 0.66% | 6,465 | 2.0 | CDP |
| Cascades | 10 | 12,647 | 12,132 | 0.42% | 3,431 | 3.7 | CDP |
| Loudoun Valley Estates | 11 | 11,657 | 9,673 | 5.15% | 4,156 | 2.8 | CDP |
| Lowes Island | 12 | 11,350 | 11,319 | 0.38% | 3,762 | 3.0 | CDP |
| Belmont | 13 | 10,542 | 9,341 | 3.2% | 3,903 | 2.7 | CDP |
| Countryside | 14 | 9,575 | 9,517 | -0.36% | 3,730 | 2.6 | CDP |
| Purcellville | 15 | 8,917 | 8,943 | -0.08% | 2,634 | 3.4 | Town |
| Moorefield | 16 | 6,406 | 4,099 | 7.68% | 5,639 | 1.1 | CDP |
| Dulles Town Center | 17 | 6,098 | 5,362 | 1.79% | 2,539 | 2.4 | CDP |
| University Center | 18 | 4,329 | 3,878 | 1.24% | 4,716 | 0.9 | CDP |
| One Loudoun | 19 | 3,242 | 2,151 | 7.67% | 5,114 | 0.6 | CDP |
| Arcola | 20 | 2,804 | 1,761 | 6.98% | 1,227 | 2.3 | CDP |
| Goose Creek Village | 21 | 2,721 | 2,193 | 7.72% | 7,198 | 0.4 | CDP |
| Lovettsville | 22 | 2,706 | 2,708 | -0.04% | 3,034 | 0.9 | Town |
| Oak Grove | 23 | 2,659 | 2,863 | 2.43% | 2,275 | 1.2 | CDP |
| Round Hill | 24 | 684 | 695 | -0.44% | 1,864 | 0.4 | Town |
| Middleburg | 25 | 677 | 671 | 0.15% | 653 | 1.0 | Town |
| Hamilton | 26 | 603 | 618 | -0.66% | 2,716 | 0.2 | Town |
| Kincora | 27 | 370 | 13 | 7.87% | 690 | 0.5 | CDP |
| Waterford | 28 | 289 | 256 | 7.43% | 798 | 0.4 | CDP |
| Aldie | 29 | 246 | 233 | 7.42% | 1,017 | 0.2 | CDP |
| Hillsboro | 30 | 110 | 116 | -1.79% | 415 | 0.3 | Town |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Leesburg is the largest city in Loudoun County.
Hillsboro is the smallest city in Loudoun County.
There are 30 cities in Loudoun County, Virginia.