English: Map of the first members of the Peloponnesian League c.506 BC.
Data from G. E. M. de Ste. Croix, The Origins of the Peloponnesian War, London, Duckworth, 1972. ISBN 0-7156-0640-9
Locations from the Barrington Atlas and cities' territory from Mogens Herman Hansen & Thomas Heine Nielsen (editors), An Inventory of Archaic and Classical Poleis, Oxford University Press, 2004.
Note that Konrad Wickert [Der peloponnesische Bund von seiner Entstehung bis zum Ende des Archidamischen Krieges, Erlangen, 1961] considers that there is no evidence of membership at this time for the cities of the Argolis and Aegina.
All of Arcadia belonged to the League, but individual members from the area are impossible to distinguish apart from Tegea and Mantinea.
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