In 1872, seven years after its foundation, Parnassos already numbered more than 300 members, while in 1890, after 25 years of existence, its members amounted to 818.

In the middle of the twentieth century, in 1951, the active members of the Society were 1010 (37 honorary, 99 regular and 64 correspondent), while between 1865 and 1951, 1273 members died. Today the regular members of Parnassos amount to 470.

Among the older members of the Society stand out various historical figures of our country and of Europe in general.

Honorary or regular members and Benefactors of Parnassos were all the members of the Royal family, from George I to Paul; several Presidents of the Hellenic Republic, such as Alexandros Zaïmis, Konstantinos Tsatsos and Michael Stassinopoulos; and many Prime Ministers, such as Spyridon Lambros, Panagis Tsaldaris, Konstantinos Demertzis, Ioannis Metaxas, Alexandros Koryzis, Themistokles Sofoulis, Alexandros Diomidis, Spyridon Markezinis, Georgios Rallis and Xenophon Zolotas.

Honorary members included some notorious foreign leaders, such as William Gladstone (1877), Georges Clémenceau (1907) and Winston Churchill (1945). Besides, due to the important national and social activities of Parnassos, many great national benefactors sought adherence to the Society: Andreas Syngros (1872), Apostolos Arsakis (1872), Marinos Korgialenios (1890), Gregorios Maraslis (1890), Georgios Averof (1890), Emmanuel Benakis (1900) and many others.

Among the most active members of Parnassos were the literary men, who shaped to a great extent the profile of the Society during the first century of its existence: Demetrios Paparrigopoulos (1869), Alexandros Rizos Rangavis (1869), Achilleus Paraschos (1870), Aristoteles Valaoritis (1871), Demetrios Vikelas (1872), Angelos Vlachos (1872), Emmanuel Roïdis (1872), Andreas Laskaratos (1873), Georgios Vizyinos (1882), Kostis Palamas (1884), Georgios Souris (1884), Gregorios Xenopoulos (1917), Georgios Athanas (1934), Thanassis Petsalis-Diomidis (1936), Spyros Melas (1938), Giorgos Theotokas (1951), Petros Haris (1951), Stratis Myrivilis (1955), Nikephoros Vrettakos (1958), Tassos Athanassiadis (1986) and many others.

Among the foreign literary men, we mention Dora d’Istria (1879), Queux de Saint Hilaire (1876), Giosuè Carducci (1897), Gabriele D’Annunzio (1898), Frédéric Mistral (1909) and Edmond Rostand (1910). Moreover, the philologists and university professors who became members of the Society undertook considerable activities within it. The most memorable of them were Georgios Mistriotis (1868), Demetrios Vernardakis (1869), Stephanos Koumanoudis (1869), Spyridon Vassis (1872), Errikos Skassis (1934), Ioannis Kalitsounakis (1941), Georgios Zoras (1942), Sokratis Kougeas (1945), Nikolaos Tomadakis, Nikolaos Livadaras, but also Ernst Kurtius (1876) from Germany, and Ettore Romangoli (1933) from Italy. Among historians and archaeologists, we mention Pavlos Karolidis (1890), Dionysios Zakythinos (1938), Apostolos Daskalakis (1939), Anastassios Orlandos (1945), Spyridon Marinatos (1945), but also Karl Krumbacher (1882), Ferdinand Gregorovius (1882), Gustave Schlumberger (1882) and Gioacchino Volpe (1933).

University professors from other branches too became distinguished members of Parnassos. We mention the philosophers Petros Vrailas Armenis (1871), Theophilos Voreas (1908) and Nikolaos Louvaris (1935); the pedagogue Nikolaos Exarchopoulos (1945); the jurists Nikolaos Saripolos (1869) and Pavlos Kalligas (1870); the theologians Konstantinos Bonis (1938), Hamilcar Alivizatos (1945) and Gerasimos Konidaris (1945); the medical doctors Theodoros Aretaios, Ioannis Haramis (1933), Nikolaos Louros (1934), Ioannis Chryssikos (1935) and Konstantinos Alevizatos (1940); and the scientists Theodoros Orphanidis (1868), Timoleon Argyropoulos, Thrasyboulos Vlissidis (1927), Ioannis Trikalinos (1946) and Georgios Pantazis.

Furthermore, the Society included musicians, such as Fridericos Karrer (1876) and Manolis Kalomiris (1917), sculptors, as Georgios Vroutos (1876), theatre artists as Demetrios Rontiris (1946), Demetrios Myrat (1948), Alexis Minotis (1987), and many others.