| Locality | Post Code |
|---|---|
| Aldie, Loudoun | 20105 |
| Arcola, Loudoun | 20148, 20166 |
| Ashburn, Loudoun | 20146, 20147, 20148, 20149 |
| Brambleton, Loudoun | 20148 |
| Broadlands, Loudoun | 20148 |
| Chantilly, Loudoun | 20152 |
| Dulles, Loudoun | 20101, 20189 |
| Fairfax, Loudoun | 22037 |
| Hamilton, Loudoun | 20158 |
| Hillsboro, Loudoun | 20132 |
| Lansdowne, Loudoun | 20176 |
| Leesburg, Loudoun | 20175, 20176 |
| Lincoln, Loudoun | 20160 |
| Lovettsville, Loudoun | 20180 |
| Lucketts, Loudoun | 20176 |
| Middleburg, Loudoun | 20117 |
| Paeonian Springs, Loudoun | 20129 |
| Philomont, Loudoun | 20131 |
| Potomac Falls, Loudoun | 20165 |
| Purcellville, Loudoun | 20132 |
| Round Hill, Loudoun | 20141 |
| South Riding, Loudoun | 20152 |
| Sterling, Loudoun | 20164, 20165, 20166, 20167 |
| Stone Ridge, Loudoun | 20105 |
| Waterford, Loudoun | 20197 |