17 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 20147 | Ashburn | 67,692 |
| 20148 | Ashburn | 64,021 |
| 20176 | Leesburg | 51,471 |
| 20164 | Sterling | 43,436 |
| 20105 | Aldie | 37,639 |
| 20152 | Chantilly | 36,674 |
| 20175 | Leesburg | 34,733 |
| 20165 | Sterling | 34,088 |
| 20132 | Purcellville | 19,817 |
| 20166 | Sterling | 14,949 |
| 20141 | Round Hill | 8,359 |
| 20180 | Lovettsville | 7,531 |
| 20158 | Hamilton | 4,979 |
| 20117 | Middleburg | 2,790 |
| 20197 | Waterford | 1,825 |
| 20184 | Upperville | 635 |
| 20129 | Paeonian Springs | 538 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 17 ZCTAs in Loudoun County, Virginia (US Census).