| Zip Code | City | Population ↓ |
|---|---|---|
| 75602 | Longview | 20,671 |
| 75670 | Marshall | 18,670 |
| 75672 | Marshall | 16,509 |
| 75650 | Hallsville | 10,703 |
| 75640 | Diana | 6,142 |
| 75692 | Waskom | 5,563 |
| 75661 | Karnack | 2,360 |
| 75651 | Harleton | 1,871 |
| 75659 | Jonesville | 37 |
| 75671 | Marshall | 0 |
| 75694 | Woodlawn | 0 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 11 ZCTAs in Harrison County, Texas (US Census).