Syros, with 20,000 inhabitants, has the largest population of all the Cyclades islands. It covers an area of 84 square kilometers and is comprised of three municipalities - Ermoupolis, Ano Syros, and Poseidonia.

The island’s capital is Ermoupolis, which is also the administrative seat of the Cyclades and home to a range of public services such as courts, prefecture office, fire department, chamber of commerce, customs, tax service, and regional subdivisions of the state agriculture, forestry, education, fishing, and commerce departments.

Ermoupolis covers an area of nearly 1,000 acres and has a population of 13,000; its area include the Manna district. 

The vibrant town of Ano Syros comprises the Galissas, Pagos and Chroussos districts and has a total population of 1,700 that’s engaged primarily in trade, agriculture, stockbreeding, bee-keeping, tourism, and the merchant marine.  

The Municipality of Poseidonia embraces Poseidonia, Vari, and Foinikas. Poseidonia is marked by stately mansions built in the 19th century as the summer homes of the rich merchants who comprised Greece’s first urban class.