Postal Code 31023 Boundary Map
Leaflet | Tiles © Esri — Source: Esri, DeLorme, NAVTEQ, USGS, Intermap, iPC, NRCAN, Esri Japan, METI, Esri China (Hong Kong), Esri (Thailand), TomTom, 2012
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| Postal Code | 31023 |
| Postal Code Name | Ahtme |
| County | Ida-Viru County |
| Municipality | Kohtla-Järve linn |
| Timezone | Eastern European Summer Time (EEST) |
| Adjacent Postal Codes | 31022 31024 31025 41545 41549 |