The Municipal Unit of Poseidonia is one of three that make up the Municipality of Syros-Hermoupolis (the Municipal Units of Ano Syros and of Hermoupolis are the other two.) With its seat in Poseidonia, this municipal unit includes the local communities of Vari, Finikas, and Poseidonia.
Area // Municipal District Poseidonia
Attributes
| Center | : | Poseidonia |
| Population 2011 | : | 3893 |
| Kallikratis Code | : | 580103 |
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