Prefix 18 contains 32 postcode records across 15 mapped localities in Netherlands.
| Postal Code | Locality / District | Administrative Area | Coordinates |
|---|---|---|---|
| Alkmaar | Alkmaar Municipality · North Holland | 52.631, 4.7486 | |
| Alkmaar | Alkmaar Municipality · North Holland | 52.6134, 4.7576 | |
| Alkmaar | Alkmaar Municipality · North Holland | 52.6204, 4.7532 | |
| Alkmaar | Alkmaar Municipality · North Holland | 52.6223, 4.7426 | |
| Alkmaar | Alkmaar Municipality · North Holland | 52.6322, 4.737 | |
| Alkmaar | Alkmaar Municipality · North Holland | 52.6319, 4.7245 | |
| Alkmaar | Alkmaar Municipality · North Holland | 52.6424, 4.734 | |
| Alkmaar | Alkmaar Municipality · North Holland | 52.6272, 4.7627 | |
| Alkmaar | Alkmaar Municipality · North Holland | 52.6525, 4.7775 | |
| Alkmaar | Alkmaar Municipality · North Holland | 52.6347, 4.7596 | |
| Alkmaar | Alkmaar Municipality · North Holland | 52.6446, 4.7552 | |
| Alkmaar | Alkmaar Municipality · North Holland | 52.6568, 4.7521 | |
| Alkmaar | Alkmaar Municipality · North Holland | 52.6571, 4.7645 | |
| Alkmaar | Alkmaar Municipality · North Holland | 52.6689, 4.7651 | |
| Oudorp | Alkmaar Municipality · North Holland | 52.6331, 4.7761 | |
| Koedijk | Alkmaar Municipality · North Holland | 52.673, 4.7538 | |
| Koedijk | Dijk en Waard · North Holland | 52.6852, 4.7387 | |
| Sint Pancras | Dijk en Waard · North Holland | 52.66, 4.7858 | |
| Stompetoren | Alkmaar Municipality · North Holland | 52.614, 4.8204 | |
| Oterleek | Alkmaar Municipality · North Holland | 52.6343, 4.8355 | |
| Grootschermer | Alkmaar Municipality · North Holland | 52.5826, 4.8474 | |
| Driehuizen | Alkmaar Municipality · North Holland | 52.5812, 4.8085 | |
| Zuidschermer | Alkmaar Municipality · North Holland | 52.5803, 4.7793 | |
| Zuidschermer | Alkmaar Municipality · North Holland | 52.599, 4.7796 | |
| Heiloo | Heiloo Municipality · North Holland | 52.5976, 4.7113 | |
| Heiloo | Heiloo Municipality · North Holland | 52.6024, 4.6937 | |
| Heiloo | Heiloo Municipality · North Holland | 52.5914, 4.6998 | |
| Bergen (NH) | Bergen · North Holland | 52.667, 4.7001 | |
| Bergen (NH) | Bergen · North Holland | 52.6699, 4.7135 | |
| Egmond aan den Hoef | Bergen · North Holland | 52.6407, 4.6596 | |
| Bergen aan Zee | Bergen · North Holland | 52.6617, 4.6323 | |
| Bergen (NH) | Bergen · North Holland | 52.6885, 4.7182 | |
| Schoorl | Bergen · North Holland | 52.706, 4.6934 | |
| Groet | Bergen · North Holland | 52.7222, 4.668 |
Based on 34 records, 32 postal code values and 15 mapped localities. Coordinate coverage is 100.0%.
| Postal code | Locality | Administrative path | Coordinates |
|---|---|---|---|
| 1811 | Alkmaar | North Holland / Alkmaar Municipality | 52.631, 4.7486 |
| 1812 | Alkmaar | North Holland / Alkmaar Municipality | 52.6134, 4.7576 |
| 1813 | Alkmaar | North Holland / Alkmaar Municipality | 52.6204, 4.7532 |
| 1814 | Alkmaar | North Holland / Alkmaar Municipality | 52.6223, 4.7426 |
| 1815 | Alkmaar | North Holland / Alkmaar Municipality | 52.6322, 4.737 |
| 1816 | Alkmaar | North Holland / Alkmaar Municipality | 52.6319, 4.7245 |
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| Code | Place | Hierarchy | Coordinates |
|---|---|---|---|
| 1811 | Alkmaar | North Holland / Alkmaar Municipality | 52.631, 4.7486 |
| 1812 | Alkmaar | North Holland / Alkmaar Municipality | 52.6134, 4.7576 |
| 1813 | Alkmaar | North Holland / Alkmaar Municipality | 52.6204, 4.7532 |
| 1814 | Alkmaar | North Holland / Alkmaar Municipality | 52.6223, 4.7426 |
| 1815 | Alkmaar | North Holland / Alkmaar Municipality | 52.6322, 4.737 |
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