Prefix 23 contains 35 postcode records across 16 mapped localities in Netherlands.
| Postal Code | Locality / District | Administrative Area | Coordinates |
|---|---|---|---|
| Leiden | Leiden Municipality · South Holland | 52.1565, 4.4898 | |
| Leiden | Leiden Municipality · South Holland | 52.1608, 4.4934 | |
| Leiden | Leiden Municipality · South Holland | 52.1508, 4.4987 | |
| Leiden | Leiden Municipality · South Holland | 52.1515, 4.5159 | |
| Leiden | Leiden Municipality · South Holland | 52.1633, 4.5095 | |
| Leiden | Leiden Municipality · South Holland | 52.1673, 4.4956 | |
| Leiden | Leiden Municipality · South Holland | 52.1761, 4.5085 | |
| Leiden | Leiden Municipality · South Holland | 52.1807, 4.5026 | |
| Leiden | Leiden Municipality · South Holland | 52.1475, 4.4845 | |
| Leiden | Leiden Municipality · South Holland | 52.1345, 4.493 | |
| Leiden | Leiden Municipality · South Holland | 52.1351, 4.4801 | |
| Amersfoort | Amersfoort Municipality · Utrecht | 52.2008, 5.374 | |
| Leiden | Leiden Municipality · South Holland | 52.145, 4.4717 | |
| Leiden | Leiden Municipality · South Holland | 52.1511, 4.4507 | |
| Leiden | Leiden Municipality · South Holland | 52.1593, 4.4639 | |
| Leiden | Leiden Municipality · South Holland | 52.1686, 4.471 | |
| Leiden | Leiden Municipality · South Holland | 52.1722, 4.4818 | |
| Oegstgeest | Oegstgeest Municipality · South Holland | 52.1811, 4.4749 | |
| Oegstgeest | Oegstgeest Municipality · South Holland | 52.1756, 4.4534 | |
| Oegstgeest | Oegstgeest Municipality · South Holland | 52.1909, 4.4756 | |
| Leiderdorp | Leiderdorp Municipality · South Holland | 52.1474, 4.5309 | |
| Leiderdorp | Leiderdorp Municipality · South Holland | 52.1609, 4.5242 | |
| Leiderdorp | Leiderdorp Municipality · South Holland | 52.1656, 4.5338 | |
| Hoogmade | Kaag en Braassem Municipality · South Holland | 52.1693, 4.5806 | |
| Sassenheim | Gemeente Teylingen · South Holland | 52.2188, 4.5448 | |
| Warmond | Gemeente Teylingen · South Holland | 52.1963, 4.501 | |
| Warmond | Gemeente Teylingen · South Holland | 52.1919, 4.5431 | |
| Roelofarendsveen | Kaag en Braassem Municipality · South Holland | 52.201, 4.6297 | |
| Oud Ade | Kaag en Braassem Municipality · South Holland | 52.1861, 4.5578 | |
| Rijpwetering | Kaag en Braassem Municipality · South Holland | 52.193, 4.5837 | |
| Nieuwe Wetering | Kaag en Braassem Municipality · South Holland | 52.2087, 4.6178 | |
| Oude Wetering | Kaag en Braassem Municipality · South Holland | 52.2115, 4.643 | |
| Zoeterwoude | Gemeente Zoeterwoude · South Holland | 52.119, 4.4984 | |
| Zoeterwoude | Gemeente Zoeterwoude · South Holland | 52.1418, 4.524 | |
| Hazerswoude-Dorp | Gemeente Alphen aan den Rijn · South Holland | 52.0943, 4.5936 | |
| Hazerswoude-Rijndijk | Gemeente Alphen aan den Rijn · South Holland | 52.129, 4.6139 | |
| Hazerswoude-Rijndijk | Gemeente Alphen aan den Rijn · South Holland | 52.1284, 4.5862 | |
| Koudekerk aan den Rijn | Gemeente Alphen aan den Rijn · South Holland | 52.1334, 4.6021 |
Based on 38 records, 35 postal code values and 16 mapped localities. Coordinate coverage is 100.0%.
| Postal code | Locality | Administrative path | Coordinates |
|---|---|---|---|
| 2311 | Leiden | South Holland / Leiden Municipality | 52.1565, 4.4898 |
| 2312 | Leiden | South Holland / Leiden Municipality | 52.1608, 4.4934 |
| 2313 | Leiden | South Holland / Leiden Municipality | 52.1508, 4.4987 |
| 2314 | Leiden | South Holland / Leiden Municipality | 52.1515, 4.5159 |
| 2315 | Leiden | South Holland / Leiden Municipality | 52.1633, 4.5095 |
| 2316 | Leiden | South Holland / Leiden Municipality | 52.1673, 4.4956 |