| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Engelsviken, Fredrikstad | 1628 |
| Postal/ZIP Codes in Fredrikstad, Fredrikstad | 1604, 1605, 1606, 1607, 1608, … |
| Postal/ZIP Codes in Gamle Fredrikstad, Fredrikstad | 1630, 1632, 1633, 1634, 1636, … |
| Postal/ZIP Codes in Gressvik, Fredrikstad | 1621, 1622, 1623, 1624 |
| Postal/ZIP Codes in Kråkerøy, Fredrikstad | 1671, 1672, 1673, 1675, 1676, … |
| Postal/ZIP Codes in Manstad, Fredrikstad | 1626 |
| Postal/ZIP Codes in Rolvsøy, Fredrikstad | 1661, 1663, 1664, 1665, 1666, … |
| Postal/ZIP Codes in Sellebakk, Fredrikstad | 1651, 1653, 1654, 1655 |
| Postal/ZIP Codes in Torp, Fredrikstad | 1657, 1658, 1659 |