How many Greek gods and goddesses were not married?

Um well in the 12 Olympians the gods and goddesses who were not married are: Ares, Hermes, Apollo (no fixed consort),

Goddesses: Athena(decided not to get married), Artemis(decided not to get married)

Demeter was technically married but to many gods, such as Posiedon, and Zeus. Although she never really had a long marriage. So i guess she can be considered as a goddess who isnèt married.

Hope this helps

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