17 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 20147 | Ashburn | 66,917 |
| 20148 | Ashburn | 62,554 |
| 20176 | Leesburg | 50,640 |
| 20164 | Sterling | 42,310 |
| 20152 | Chantilly | 35,538 |
| 20165 | Sterling | 34,222 |
| 20105 | Aldie | 33,967 |
| 20175 | Leesburg | 33,189 |
| 20132 | Purcellville | 19,114 |
| 20166 | Sterling | 13,479 |
| 20141 | Round Hill | 8,425 |
| 20180 | Lovettsville | 7,571 |
| 20158 | Hamilton | 4,886 |
| 20117 | Middleburg | 2,997 |
| 20197 | Waterford | 2,359 |
| 20129 | Paeonian Springs | 533 |
| 20184 | Upperville | 442 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 17 ZCTAs in Loudoun County, Virginia (US Census).